Diamond Certified Companies are Rated Highest in Quality and Helpful Expertise.

  • Why this rating is the most accurate.
  • Our editors gather deep company info.
  • Performance is Guaranteed.

Diamond certified companies are top rated and guaranteed

Why Trust Diamond Certified Auto Transmission Shops Rated Highest in Quality?

Photo: Delta Transmission (2014)

You are the customer. If your goal is to choose an auto transmission shop that will deliver high customer satisfaction and quality, you’ll feel confident in choosing a Diamond Certified transmission repair shop. Each has been rated Highest in Quality in the most accurate ratings process anywhere. And you’re always backed by the Diamond Certified Performance Guarantee. Here’s why the Diamond Certified ratings and certification process will help you find a top-rated auto transmission repair shop and is unparalleled in its accuracy, rigor and usefulness:

1) Accuracy: All research is performed by live telephone interviews that verify only real customers are surveyed, so you’ll never be fooled by fake reviews.

2) Statistical Reliability: A large random sample of past customers is surveyed on an ongoing basis so the research results you see truly reflect a Diamond Certified company’s top-rated status.

3) Full Disclosure: By clicking the name of a company above you’ll see the exact rating results in charts and read verbatim survey responses as well as researched articles on each qualified company.

4) Guaranteed: Your purchase is backed up with mediation and the Diamond Certified Performance Guarantee, so you can choose with confidence.

Click on the name of a Diamond Certified company above to read ratings results, researched articles and verbatim customer survey responses to help you make an informed decision.

More than 200,000 customers of local companies have been interviewed in live telephone calls, and only companies that score Highest in Quality in customer satisfaction–a 90+ on a 100 scale–as well as pass all of the credential-based ratings earn Diamond Certified. By requiring such a high score to qualify, the Diamond Certified program eliminates mediocre and poorly performing companies. Read detailed information about the ratings and certification process.

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Chester Kniss is a lifetime veteran of the automotive industry and owner of Delta Transmission, a Diamond Certified company since 2007. He can be reached at (925) 709-4984 or by email.

Chester Kniss

diamond certified contributor profile and expert article

Chester Kniss: A Mechanical Mind

By James Florence, Diamond Certified Resource Reporter

ANTIOCH — When asked how he got involved in the auto repair field, Chester Kniss simply replies that he’s always been mechanically minded. “I’ve been interested in cars since I was a little boy, so I picked things up pretty naturally,” he says. “At 10 years old, I was able to accurately diagnose car problems, and by age 15, I’d built my first transmission.” After high school, Chester went directly into the automotive industry, where he started out working on diesel trucks. In 1994, he was hired at Delta Transmission, and 12 years later, he purchased the business from the owner.

Today, Chester says he still finds satisfaction in pursuing his lifelong livelihood. “I just enjoy working on cars. At this point, almost every aspect of my life involves cars, so I guess it’s become a part of who I am.”

A lifetime resident of the East Bay, Chester resides in Oakley with his wife, Beverly, and their two children. Outside of work, he engages in a variety of automotive-centered activities. “I’ve been dirt track racing competitively since 1994 and continue to do that today,” he says. “My wife grew up around racing, so we both love it, and now our son races as well.” When asked what he does to relax in between races, his response is hardly surprising: “Work on cars.”

In regard to a professional philosophy, Chester espouses the importance of honesty. “Besides understanding how to do the job itself, the most important part of running a business is being honest with your customers,” he affirms. “When you’re honest and fair, customers will return, which is the lifeblood of any business—especially one like ours, where all the advertising is word-of-mouth.”

When asked the first thing he’d do if he were to retire tomorrow, Chester says he’d head back to the track. “I’d probably go racing. Right now, all the top-notch guys in my racing class are at the Super Nationals in Boone, Iowa, so I’d head up and watch that. Other than racing, I wouldn’t mind taking a trip to Hawaii.”

Ask Me Anything!

Q: What was your first car?
A: A 1972 Dodge Charger.

Q: What’s your dream car?
A: Pretty much any ’60s Ford or Dodge.

Q: Do you collect anything?
A: Cars and car parts.

Q: What kinds of movies do you like?
A: I like “The Fast and the Furious” series.

Q: Are you an early bird or a night owl?
A: Both. I’m up early and I go to bed late.

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Transmissions: To Flush or Not to Flush?


ANTIOCH — Much like a “quick stop” oil change, a transmission flush provides a fast and affordable means of maintaining a vital vehicle component. However, upon closer inspection, this convenient service may not be as good an idea as it appears.… Read more

Expert Video Tip

Video: Rethinking Transmission Flushes

Complete Video Transcription:

ANTIOCH — Host, Sarah Rutan: A transmission flush is a popular service, but according to some automotive professionals, it may not be such a good idea. Today… Read more




  • Acura

  • Audi

  • Chrysler

  • Ford

  • GM

  • Honda

  • Hyundai

  • Infiniti

  • Isuzu

  • Jaguar

Land Rover
Volkswagen / VW
Chevrolet / Chevy

manual transmission repairs
semi-automatic transmission repairs
reconditioned transmissions
manual transmission rebuilds
racing transmission service
high performance transmission repairs
wholesale transmission parts
truck transmission repair
diesel transmission repairs
transmission flushing
transmission fluid replacement
standard transmission service
import transmissions
domestic transmissions
transmission tune-up service
salvage transmission replacement
automatic transmission maintenance
marine transmission repairs
motorcycle transmission service
heavy truck transmission repairs
transmission repair
transmission replacement
rebuilt transmissions
automatic transmission rebuilding
auto transmission service
used transmission sales
remanufactured auto transmissions

Bay Point
Bethel Island
Discovery Bay
El Cerrito
El Sobrante
Hilltop Mall
Los Medanos
North Richmond
Pleasant Hill
Point Richmond
Port Chicago
Port Costa
Rheem Valley
San Pablo
San Ramon
Tara Hills
Vine Hill
Walnut Creek
Walnut Heights
West Pittsburg


American Automobile Association (AAA) (http://www.aaa.com/)
Automotive Service Association (ASA) (http://www.asashop.org/)
Alliance Of Automotive Service Providers (AASP) (http://www.autoserviceproviders.com/)
National Institute for Automotive Service Excellence (ASE) (http://www.asecert.org/)
Automatic Transmission Rebuilders Association (ATRA) (http://www.atra.com/)
Automatic Automotive Warehouse Distributor Association (AWDA) (http://www.awda.org/)
California Bureau of Automotive Repair (BAR) (http://www.autorepair.ca.gov/)

Know What You Want
Know Just What You Want and Need from Contra Costa County Auto Transmission Shops

Before you start looking for an auto transmission shop in Contra Costa County, think some about what you really need from an automatic transmission or manual transmission shop.

Write some things down. Put down perhaps things like transmission know-how, professionalism, responsiveness, low cost, and good customer support for Contra Costa County auto transmission service.  You may be looking for an auto transmission shop in the cities of Concord, Walnut Creek, Richmond, Pittsburg, Antioch, San Ramon, Danville, Brentwood, Martinez, and Pleasant Hill, one well-located with certified automatic transmission specialists. You may be especially wanting someone to spend time understanding your automatic transmission questions and fully explaining different possibilities for your transmission work.

Being clear on what’s needed for your automatic transmission work will help a lot as you listen to the responses of transmission repair garages. Here are some questions to think about:

  • Do I want to have a Diamond Certified company that is rated best in quality and has the Diamond Certified Guarantee?
  • Will I be coming back every 24,000 miles for automatic transmission fluid or transmission filter changes or other auto transmission service?
  • What does my owner’s manual have on automatic transmission fluid and filter changes?
  • How long has the automatic transmission shop been doing car transmission work?
  • How will the shop decide between repairing and replacing my car transmission?
  • What does regular transmission check-up service cost and include?
  • How long will automatic transmission checks or repairs take?
  • What would be a range of prices for a rebuilt transmission or a remanufactured transmission?
  • What are the exact noises or other signs that have made me concerned about automatic transmission problems?
  • Will the automatic transmission technicians have ASE, ATRA or manufacturer certifications?
  • Does the automatic transmission or manual transmission shop have proof of a good reputation with customers for transmission problems in Contra Costa County?
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What To Ask In Person
What to Ask Contra Costa County Auto Transmission Representatives at the Shop

You may want to visit some automatic transmission places in Concord, Pittsburg, Walnut Creek, Antioch and Richmond and other areas of Contra Costa County. Questions like those following may help:

  • Is it likely that my automatic transmission will need only minor repairs, or will it probably have to be replaced with a rebuilt or remanufactured transmission?
  • What is the difference between a rebuilt automatic transmission and a remanufactured transmission, how do the costs differ, and what other information goes into making the decision?
  • How likely is the estimate for my car transmission work to be accurate?
  • How will we stay in contact while you are working on my automatic transmission or gearbox?
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  • What To Ask References
    Questions for Previous Auto Transmission Customers in Contra Costa County

    Have customers of a particular auto transmission shop in Contra Costa County really received good automatic transmission or manual transmission service?

    That’s a big issue, a question that isn’t that easy to answer unless you have a source of information beyond the simple statement from a shop representative. Diamond Certified auto transmission shops give automatic transmission customers the advantage of a thorough rating system.  If you want quality from an automatic transmission or manual transmission company in Contra Costa County and the greater Bay Area, you can be confident with Diamond Certified companies. You can read Diamond Certified info on all certified companies, including word-for-word responses to surveys of transmission services customers. And you won’t be fooled by false reviews because all research is done by live phone interviews with lots of transmission service customers.

    If you can’t find a Diamond Certified automatic transmission shop or manual transmission service within reach, do some research of your own. Even if you’re in a hurry for automatic transmission service, take a little time to check references. If you do, auto transmission shops in Contra Costa County may be willing to give you a list of recent auto transmission customers you can call. Keep in mind though that references provided by other shops will not be equal in value to the large random sample of transmission customers surveyed by the Diamond Certified ratings process. That’s because references may be “cherry-picked,” instead of being randomly selected from all customers, so shops may simply be giving you some satisfied customers to check with.

    If you do call on automatic transmission or manual transmission check-ups or repair references, ask for a list of recent transmission customers (to avoid the transmission shop giving you only satisfied ones) and call those people. Ask general questions about their experience with people at the automatic transmission shop as well as specific questions about the checking of transmissions and the repair and replacement of car transmissions. Questions might include:

    • What automatic transmission services did the shop do for you?
    • Were you pleased with the gearbox or transmission work on your transmission problems at this Contra Costa County auto transmission shop?
    • Were you happy with the time it took for the automatic transmission fluid and transmission filter change, or other transmission work the shop did?
    • Did the auto transmission people treat you well and answer your questions clearly?
    • Was the automatic transmission or manual transmission cost fair, and close to the estimate?
    • What parts of the work did the Contra Costa County transmission service do especially well?
    • Do you think you will go back there if you have automatic transmission problems or need your transmission fluid changed?
    • Would you highly recommend this car transmission shop for servicing transmissions, or have you recommended this auto transmission shop already?
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  • Review Your Options
    Find and Hire a Trustworthy Auto Transmission Service in Contra Costa County

    The Diamond Certified symbol has been awarded to companies that scored Highest in Quality in an accurate ratings process.

    You may have a fairly good feel at this point for your automatic transmission shop choice from your conversations and notes, and may be close to a decision for one transmission services provider over the others.

    Before finalizing your choice, think about these things:

    • Can an auto transmission shop in Contra Costa County meet each of your needs, including speed of service and quality of work and parts?
    • Will the shop representatives be able to talk with you clearly and courteously, and take the time to explain the best transmission service choices?
    • Is the auto transmission shop respected by customers in Contra Costa County for transmission problems and services such as transmission fluid and filter changes?

    Find and Contract a Good Auto Transmission Shop in Contra Costa County or the Greater Bay Area
    The final question to ask again before choosing your auto transmission shop in Contra Costa County could be this one:  Do I know my transmission needs and expectations, and have I found an automatic transmission service that has the best chance of meeting them?

    In particular, think about the advantages of a Diamond Certified auto transmission location.

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  • How To Work With
    Before you Hire: Consider How to Get the Best Auto Transmission Shops in Contra Costa County

    In California all auto transmission garages are licensed by the Bureau of Automotive Repair, but you want the one automatic transmission provider that best solves your transmission problems. All Diamond Certified shops are checked in advance for high quality.  If you don’t choose a Diamond Certified shop in Contra Costa County, be sure to look carefully yourself for a shop that can satisfy your transmission needs.

    Transmission shops in Contra Costa County, including those in the larger cities of Pittsburg, Concord, Antioch, Walnut Creek and Richmond, may have more experience in automatic transmission or manual transmission work than do others, and may have transmission work certifications, such as those from manufacturers, the ASE, or the ATRA.

    Now that You Have Found the Auto Transmission Shop, Get Accurate Auto Transmission Estimates From Contra Costa County Mechanics
    Be sure to take the time to understand the transmission work you need. You should be comfortable with the details and the choices. Ask the needed questions, and take note of the responses.
    Remember that you should get an estimate before the automatic transmission or gearbox work starts, and that after that you have to authorize work that will go cost more than the estimate.

    Sign a Contract for Auto Transmission Work in Contra Costa County, Including Automatic Transmission Work in the Larger Cities of Pittsburg, Concord, Antioch, Walnut Creek and Richmond
    When you’re happy with the info from the Contra Costa County auto transmission shop, sign the estimate and automatic transmission or manual transmission service contract. See that the auto transmission facility has a phone number where the rep can call you while your transmission problems are being taken care of.

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  • Be a Good Customer
    How Can You Be a Good Auto Transmission Shop Customer

    Good quality transmission service is the auto transmission shop’s concern.  But you have a part too. Think about simple steps you can take for a better transmission work experience:

    • Be clear in your conversation with the automatic transmission mechanic. Tell him or her what you expect simply and politely.
    • Verify your phone information to avoid delay, and be clear on which party is to do the calling with Contra Costa County auto transmission shops, including those in the cities of Brentwood, Danville, and San Ramon.
    • It works for you and for the shop when you make the effort to be a good car transmission service customer. The Contra Costa County auto transmission shop will work well with people who are clear and responsible.
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Check The Work
Check the Completed Auto Transmission Repair or Replacement Work Against Your Written Invoice

When the auto transmission work is done, your shop must provide an invoice with:

  • The auto transmission location name and ID number.
  • The auto transmission work completed.
  • The parts for which you are to be charged.
  • The total price charged for auto transmission labor.


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Written Warranties
Get Warranties from Contra Costa County Auto Transmission Mechanics

Confirm warranties before you leave the auto transmission shop. The paperwork should have:

  • The auto transmission shop name and identification number.
  • Details on what’s covered, including replacing parts or refunding cash.
  • Instructions for following through on the warranty.
  • The duration of the warranty
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Top 10 Requests

Auto transmission shops in Contra Costa County handle different needs. Here are some common types of auto transmission work:

Gearbox repair or replacement is sometimes necessary, which means rebuilding a transmission, or remanufacturing and installing a new transmission. Gearbox is another term for transmission: an automatic gearbox is an automatic transmission. An automatic gearbox allows the vehicle to change gears without driver effort; a manual gearbox requires the driver to manually operate a clutch and a gearshift lever to move between gears.

Exactly what is a transmission? Transmissions are sets of gears: they provide the way that a car gets the energy from its racing engine out to its slower-turning or unmoving wheels to perform useful work–to get you started, get you going faster, let you slow down, and make it possible for you to stop the car again while the engine continues to run. Transmissions have moving parts that can fail over time. Transmission work can cost a great deal, because car transmissions have become extremely complicated.  Auto transmission repair involves the cleaning and inspection of hundreds of parts during major transmission work. Parts must be put into sub-assemblies, which are adjusted and put into the transmission case, and testing has to be performed at various stages.  When these earlier steps are completed, the added work of putting the transmission in the vehicle must be done. It is important to realize however, that more often than not a new transmission is unnecessary, and that the cost of automatic transmission work which a car needs can easily be less than a quarter of the price of a redone transmission.

Transmission Fluid
Transmissions, whether automatic transmissions or manual transmissions, need lubrication to reduce wear between moving parts, and this is what transmission fluid is for. But it is important for the car owner to know that transmission fluid is doing more than that: it is preventing heat build-up and transferring power from the car engine to the wheels. When transmission fluid or transmission oil wears out through shear, it loses the necessary grabbing properties that help clutch plates hang onto each other within the transmission during driving.  This transmission fluid breakdown allows these moving parts to grind against one another and cause lots of transmission-destroying heat. Keep in mind that some types of transmission fluid services replace far less fluid volume than others, and that a full transmission fluid exchange is necessary in order to replace almost all of the worn out fluid with a fresh amount of good transmission fluid.

Automatic Transmission
The automatic transmission is the kind of power transferring system that does not require the driver to use a clutch and a gearshift to move between gears. A modern automatic transmission has lots of small pieces, but can be thought of as several main parts.  The bell housing is a cone-like case, beside the engine in cars with front-wheel drive, or underneath the car in other cases. Gear types include main and planetary gears. Red transmission fluid lubricates moving parts, and is kept clean by a transmission filter: changing the transmission fluid and the transmission filter every couple years will likely be all your automatic transmission will need for a long and healthy life. A number of sensors and a computer are key parts of the modern automatic transmission, and your car may have a Transmission Control Module which can be thought of as a computer.

Manual Transmission
Manual transmissions are much less popular in the US than automatic transmissions.  Manual transmissions require more work of the driver, involving pressing a clutch pedal with the left foot and moving a gear shift with the right hand in order to change gears appropriate to vehicle and engine speeds. Manual transmissions are more common than automatic ones in other countries; they cost less, weigh less, use less fuel, and perform better.  The two types of manual transmissions are the unsynchronized type and the constant-mesh gearbox type; the second is the more common type of the two.

Transmission Problems
Transmission problems are when your manual or automatic transmission won’t work, or won’t work smoothly as it should. Since transmission problems can be expensive, you will want to avoid this by preventive car transmission service. You should have your transmission fluid checked a couple of times a year, and have any leaks fixed–there are only about six places where leaks happen and these spots should be looked at. Also important is replacing your transmission fluid filter: this may never have been done on your car transmission, and is much cheaper and easier to think about than rebuilding a transmission or having to replace a transmission with a remanufactured transmission.

Transmission Repair
Transmission repair is cheaper than transmission replacement.  That’s why car owners are careful to have their transmission fluid changed, and to make sure they are not losing transmission fluid through leaks. Replacing the transmission filter will fix quite a few transmission problems, and other fairly simple transmission repair steps may be possible at a trustworthy auto transmission shop. Eventually, transmission repair may not be enough, and your transmission will need to be rebuilt or remanufactured. Rebuilding transmissions is costly because of all the parts involved. The important thing is to keep the car transmission from needing to be replaced or rebuilt, at great expense.  That extra auto transmission cost is really unnecessary if you have taken simple preventive steps of transmission service.

Torque Converter
The torque converter is a central part of the automatic transmission, and repairing or replacing a torque converter may be necessary in a worn transmission. The torque converter is that part of the automatic transmission that manages the linking between the auto engine and the transmission gears; it is present in an automatic transmission instead of the clutch that a manual transmission has. The torque converter is a connection of hydrodynamic fluid for transferring power from the car engine to the wheels.

Transmission Fluid Change
Transmission fluid change is important for extending the life of something which is extremely important and very expensive to replace: your car transmission. Flushing and changing automatic transmission fluid takes out small pieces of clutch material and metal that wear down your transmission, gives your transmission better lubrication, gives your clutches better grabbing ability and reduces harmful transmission overheating. A typical approach to transmission service may be to have the transmission technician only take off the transmission fluid pan, put in a new transmission filter, put the pan back on, and replace the rather small amount of transmission fluid that was drained away.  Even though that type of transmission fluid service is clearly helpful, it may only replace less than half of the transmission fluid, leaving lots of old fluid in your transmission.  That worn transmission fluid lets parts slip and allows damaging heat to happen. A full transmission fluid exchange is an important preventive transmission service step, and something you should consider at a reliable auto transmission shop. By getting a transmission fluid exchange service, you can replace nearly all of the old, used transmission oil.

Car Transmission
Any machine, for example a car, has a power source and a way of putting that power to useful purpose.  For your car, the source of power is the internal combustion engine, and the means of transferring that power to the wheels is the auto transmission.  The car transmission is either an automatic transmission where the gear shifting is done for the driver by the transmission itself, or a manual transmission with a clutch pedal and gearshift for the driver to use to change gears. The term transmission may sometimes be used to mean only the gears and gear trains of the gearbox, which change speed and torque. Auto engines need to run at relatively high speeds which are not workable for things like getting going, going slowly, changing speeds over a broad range, and coming to a stop; it is the car transmission that makes these practical uses of the car possible. The transmission, connected to the engine by the crankshaft, turns the higher speed of the engine into the lower speed and higher torque of the wheels.

Auto transmission repair and replacement shops in Contra Costa County or the greater Bay Area may use some of the following brand names:

  • Woodfins
  • MyCertifiedService
  • Chevy Transmission
  • TCI Auto
  • Rebuilt Auto Transmissions
  • JEGS
  • Jasper Transmissions
  • Subaru Transmissions
  • SW Transmissions
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Glossary Of Terms
Glossary of Terms for Transmission Repair Services

Below are key auto transmission repair, transmission replacement, and transmission service terms that may be helpful for understanding issues relating to automatic transmissions, manual transmissions, and gearboxes:

adaptive learn automatic transmission
A newer type of automatic transmission.  This type of automatic transmission can improve its own efficiency in response to the events of actual driving, and can make up for transmission wear.

aftermarket auto parts or aftermarket auto transmission
Auto transmissions or transmission parts not sold by the original maker of the car, parts that will typically cost less than those bought from the car maker.

air check
A test during automatic transmission assembly. The automatic transmission air test checks the hydraulic soundness of automatic transmission parts including valves and clutch packs.

Automatic transmission, abbreviated.

Also known as: automatic transmission, automatic car transmission

automatic drive
Another term for automatic transmission, the type of car transmission where the car drives itself automatically in the correct gear without needing manual clutch pedal use and gear shifting as with a manual transmission.

Also known as: automatic transmission, automatic car transmission

automatic gearbox
Can refer to the housing where the gears of an automatic transmission are contained, or can refer to an automatic transmission itself.

Also known as: automatic transmission, automatic car transmission, gearbox

automatic transmission
The type of auto transmission, as distinct from a manual transmission, which is able to change gears by itself to the correct gear for the speed the car is traveling.

Also known as: automatic gearbox, automatic car transmission

automatic transmission fluid (ATF)
The fluid inside the automatic transmission. Automatic transmission fluid is often red, a mineral- or oil-based liquid used to reduce wear on moving transmission parts.  Automatic transmission fluid also works to transfer power in the automatic transmission and to cool moving parts.

Also known as: transmission fluid, automatic car transmission fluid

Automatic Transmission Rebuilders Association (ATRA)
A large organization of transmission repair providers.

auto transmission shop
An automotive shop that specializes in auto transmission service and transmission repair and replacement work for automatic transmissions and manual transmissions.

Also known as: auto transmission garage, auto transmission facility, auto transmission repair service, auto transmission service, transmission replacement shop

auto transmission system
The transmission or gearbox that transfers power from the drive shaft of the auto engine to the car wheels for forward and reverse vehicle motion. The two types of auto transmissions are automatic transmissions and manual transmissions.

Also known as: car transmission

A device in a car transmission that connects or disconnects two parts within the driving machinery. In a manual transmission, the clutch is operated by a pedal that disengages the driving force of the engine from the gears driving the wheels to create forward or reverse motion.

Also known as: clutch pedal, automatic clutch

drive line
The system in a car for transferring power between the vehicle’s motor and the wheels. The drive line largely includes the car transmission, or gearbox.

Also known as: drive system, transmission

electronically controlled transmission (ECT)
A car transmission under the control of a computer.

Also known as: computerized transmission, computerized car transmission

fluid drive
A fluid coupling for transferring power within the car transmission.

A toothed part in a car transmission or gearbox, made for transferring rotational motion from the engine out to the wheels.

Also known as: gear mechanism, transmission gear mechanism

gear case
The metal housing in which the gears in the car transmission gear train are enclosed and sealed.

Also known as: gearbox

hydraulic transmission
A transmission operated by liquid forced through a small opening.

Also known as: hydraulic transmission system, transmission

manual transmission
A hand-operated transmission for selecting the correct gear ratio for the existing engine speed and vehicle speed.

Also known as: stick shift, standard transmission, manual car transmission

OEM transmission
A transmission made by the original equipment manufacturer, i.e. by the maker of the original car. A transmission bought from the car maker will tend to be more expensive than one gotten elsewhere.

Also known as: original equipment manufacturer transmission, stock transmission

standard transmission
The same transmission known as a manual transmission. This is the type of car transmission, as distinct from an automatic transmission, which requires the car driver to shift between gears in the transmission by the use of a clutch pedal and a gear shift.

Also known as: stick shift, manual transmission, manual car transmission, manual gearbox

stick shift
Another name for a standard or manual transmission, deriving from the term for the gear shift lever which the driver manually operates, located on the steering column or on the floor between the driver and passenger seats.

Also known as: standard transmission, standard car transmission, manual transmission, manual car transmission

torque converter
A round car transmission part that moves engine power to the car’s wheels by changing fluid direction. The torque converter of today’s car transmissions follows the earlier transmission fluid coupling.

A car transmission or gearbox with at least two ratios for matching engine speed and torque with the car wheels.

Also known as: gearbox, car transmission, auto transmission

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Frequently Asked Questions
FAQ for Transmission Repair and Replacement Shops

Q: Why choose a Diamond Certified auto transmission shop?
A: Diamond Certified ends the guessing game by offering the auto transmission services consumer a list of top-rated local companies who have passed the country’s most in-depth rating process. Most companies can’t pass this rigorous standard, which means only local auto transmission shops rated Highest in Quality earn the Diamond Certified award. American Ratings Corporation also keeps track of every Diamond Certified company with in-depth and ongoing research and ratings. And your auto transmission purchase is backed by the Diamond Certified Performance Guarantee. So you’re able to feel confident choosing a Diamond Certified auto transmission shop for your auto transmission needs.

Q: What rights do I have as a consumer in San Mateo County when it comes to manual and automatic transmission repair and replacement services and transmission fluid changes?
A: In place in California since 1974, the Automotive Repair Act gives you the right to an advance estimate on car transmission repair or replacement services. When the work is completed, you are entitled to a detailed summary of the transmission work done, the related costs, and a list of the parts for which you are being charged. More information is available at the Bureau of Auto Repair website.

Q: How should my automatic transmission fluid look?
A: If it’s not a bright cherry red, you may want to have it checked. Other colors could be a sign of automatic transmission problems.

Q: What is the right interval for changing my automatic transmission fluid?
A: Having your transmission filter and automatic transmission fluid changed every 24,000 miles is an excellent idea. Unfortunately, most car owners ignore this recommendation.  Doing this one thing would probably be enough to keep your transmission healthy for a long life. Food for thought.

Q: What are some common signs of transmission problems?
A: One common sign of transmission problems is a low level of automatic transmission fluid, or evidence that transmission fluid, which is generally red but could be confused with power steering fluid, has been leaking from your automatic transmission. Unusual noises coming from the car transmission, shuddering and hard work at shifting, a slipping of the transmission (where the engine speeds up but the car doesn’t move forward or backward at the pace it normally would), or failure of the car to move would all be possible indications of transmission problems.

Q: Is it okay to drive when my car transmission has been leaking automatic transmission fluid?
A: Even a small decrease of automatic transmission fluid volume will change the way the transmission works. You should seriously consider seeing a reliable auto transmission shop in San Mateo County right away if not sooner.

Q: What does an annual transmission check cost?
A: The answer will vary, but you may find that such transmission services as a road test and certain automatic transmission checks will be done at no charge.

Q: What is automatic transmission fluid exchange?
A: Transmission fluid exchange goes beyond the basic automatic transmission fluid service, which may replace about half of your car transmission fluid.  Transmission fluid exchange replaces nearly all of your used transmission fluid with fresh fluid for improved performance.

Q: What are some common automatic transmission services?
A: The auto transmission shop will check the level of your automatic transmission fluid, and determine the condition of the fluid. The shop might road test your automatic transmission with both a stationary test and a driving test, looking for evidence of slipping, early or late shifting, irregular shifting, or hard or soft shifting. A pan examination looks for damage inside the automatic transmission.

Q: How long will it take to repair my transmission?
A: The amount of time it takes to fix your automatic transmission or manual transmission will vary of course, based on the type of transmission problem you have. Routine exams will allow you to get the car back the same day. Many transmission problems require only minor repairs, and these can also be done within the day. Rebuilt transmissions will take longer.

Q: What sort of warranties come with a rebuilt or replaced transmission?
A: Various warranties will probably be available, ranging perhaps from 6 months to 5 years. A lifetime warranty may be available in some cases.

Q: What does it mean to have my automatic transmission scanned?
A: Scanning hooks a computer up to the one in your car to look for trouble codes and check sensors, and may find problems with the electronic part of your transmission.

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