Frequently Asked  Transmission Questions:

Click on the following links to find answers to any of your transmission questions!


1. How do I check the transmission fluid level?

Always check the fluid level with the engine running (except Honda), the transmission in "park" (except Dodge products which should be in neutral with the emergency brake applied), and with the engine at operating temperature. Remove the dipstick and wipe with a rag. Insert the stick fully and remove. Look at both sides of the stick  and take the lowest reading. Repeat the process a couple of times.

(Tip) If you have added fluid, go through the same procedure, but repeat the process several times before you look for a reading. Some of the added fluid will adhere to the side of the filler tube and can give a false reading.

(Tip) If the fluid level is low, you have a leak! Transmissions do not consume fluid. Have the leak diagnosed and repaired to prevent more serious problems.

After you have added fluid, drive the vehicle for a mile or two, then recheck the level. This is especially important in front wheel drive vehicles.

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2. I have a leak. Can you tell me how much it will cost to repair it?

There are numerous places that a transmission can leak. They include: the pump, shift lever seal/s, kickdown seal, electrical connection/s, governor cover, speedometer, rear output seal or axle seals, servo cover/s, filler tube, throttle cable, pan, side cover, cooler lines, and differential cover.

The real question is: What is/are the source/s of the leak/s. Most people can only see the bottom of the unit, and therefore conclude that the bottom pan gasket is leaking when, in reality, the leak is from above and running down and around the pan. Therefore, it is imperative that the unit be visually inspected to evaluate the leak situation!

So, the answer to the question is: No, I can't without seeing the vehicle.

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3. Can I drive with a transmission leak?

It depends on the rate of fluid loss. A minor or slow leak will allow you to drive as long as you maintain the level in the normal range. You will have to establish the rate of loss and replenish as necessary. It should be obvious that if fluid is running out as a stream, that you won't go very far. A transmission will usually operate "normal" until the fluid loss is a quart or more. Then the unit will exhibit abnormal operating symptoms and internal damage is occurring. What started as only a leak can result in a major repair bill if ignored!

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4. Can you tell me how much it will cost to overhaul my transmission?

My first question back to you is: Which model transmission do you have and how do you know it needs to be overhauled? Occasionally, a poorly running engine, restricted exhaust, computer or sensor, poor electrical ground, or other problem not internal to the transmission will be the cause of abnormal operation. Tragically, I have had numerous vehicles brought into the shop having had major work done on the transmission itself or the unit replaced, but the operation problem is still present. This usually turns out that the problem was never in the transmission, therefore never resolved. What a waste!

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5. How long does a transmission normally last?

The is no accurate answer to that question. The mileage or time of use before major problems occur will vary greatly, and therefore, I don't see a correlation between mileage and expected transmission failure. It is not unusual that the first few years after a newly designed transmission hits the road, that early failures occur. But, in later years with updates to the original design, the units become more reliable. The three major factors in the life expectancy are periodic maintenance, maintaining proper fluid level, and driving habits.

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6. How can I make my transmission last longer?

Just like the dentist tells you, "Don't ignore them." Check the fluid level and condition periodically, repair any leaks/problems promptly, service the unit on a regular basis, and add an auxiliary cooler if the vehicle is used for towing, commercial, or high ambient temperature climates. Some units should have a shift kit installed. Synthetic fluid may benefit some applications. Check with us for advice to your specific application and needs.

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7. What is a "shift kit?"

The kit is an aftermarket service pack that has been researched and developed to compensate for design deficiencies discovered in a particular transmission. In most cases, the kit improves the quality of shifts, increases the internal pressure that operates the unit, and provides better lubrication.

Note: Not all transmissions need the kit.

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8. Will it hurt to overfill the transmission?

In a word, no! Although, it is possible that gross overfilling can cause the fluid to be subjected to moving parts and become aerated which could cause abnormal operation. You may also notice leaks that ordinarily would not occur.

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9. Will overfilling "blow" seals?

In a word, no! The transmission case is vented preventing pressure buildup in normally un-pressurized areas. Severe overfilling can raise the fluid level such that the transmission may lose fluid through the vent or leak from seals that are above the normal fluid level, but the fact remains that the seals that are under pressure and those that are not will not change because of the fluid level.

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10. If I tell you the symptoms, can you tell me what will repair my problem?

I wish it were that simple. Don't get me wrong, but rarely have I had such an accurate description from a customer covering all needed information that the conclusion reached from that description was the correct one. In most cases, if I performed the repair based solely on the customer's perception, the problem would not have been resolved. Most people, including general technicians, don't have the depth of knowledge to adequately diagnose transmission problems.

The best I can do is give you information that might help you understand the problem or symptom, and provide some insight into some of the possible solutions.

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11. I had repair work done, and now the transmission is acting up.

If you notice problems with your transmission right after other repair work has been done, call it to the attention of the technician or facility that performed the repair. Occasionally, a problem may be inadvertently created during a repair. But, don't wait too long; this "unintended consequence" should be investigated as soon as practical. Logic dictates that if the transmission worked well before, it should after. Just remember to use some diplomacy.

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12. I have a computer controlled transmission and now the transmission is acting up. What could it be? Do I need a new transmission?

If you notice problems with your transmission, don't automatically assume that the problem is actually in the transmission. Computers receive information from numerous sensors, process the information, and then signal/operate the transmission. Often, the problem is in one of the sensors, an electrical connection, or system ground. In such a case, any work on the transmission will not resolve the problem. Equipment called scanners can "read"  sensor values along with any codes stored in the computer and help pin point the source of most problems.

Therefore, it is imperative that the entire control system be diagnosed before the transmission is attacked. Just remember, "It's not your  Father's Oldsmobile from the 60's. "

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13. How do I find a good repair facility?

Maintaining you vehicles today can represent a major investment. Therefore is it financially important that you establish a relationship with a facility that you can trust and have confidence in. As far as transmission repair, I generally recommend the shop with the latest equipment and technology and adequately trained technicians to solve any of your problems in a timely and professional manner.

As far as general repair, the most reliable approach is to ask friends, co-workers, or members of any organization that you may belong to, who they use. That's usually the best source to get reliable information about their experiences with local repair facilities.

Contact your local Better Business Bureau to find out how long they've been in operation, how their track record has been in handling customer complaints, and other valuable information.

When you drive into a facility, use common sense. Does the shop present a credible, professional appearance? Does the shop look clean and organized? Do the employees appear to show pride and competence? Don't be afraid to use your gut feeling.

If you find a facility that you think will be right for you, have them perform a minor repair or periodic maintenance service to see how they operate. Note whether the final bill matches the estimate, if they keep you informed about the progress of the job, and if the repair was done in a timely manner. Did they push for more repairs than you felt were necessary?

When you talk to the service writer, is he/she knowledgeable, concerned, listen to you with the indication that they care about you as a person and not a potential profit? Were all of you questions and concerns addressed to your satisfaction, or did you feel intimidated? Most good shops will be interested in helping you form a long lasting relationship, so tell them what your criteria is from the start, and see if their answers match your expectations.

A good relationship with a repair facility takes some investment of your time and money, and should be done conscientiously, but the effort made can be invaluable in the long run. The worst thing you can do is run from place to place chasing all the come-ons, specials, and deals. Those never work out well.

Note: Good service is not cheap, but bad service is a total waste of your time and money!

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14. Can I tow in overdrive?

It is our advice to not tow while using overdrive; We recommend instead that you use the "normal" drive position. You can also find advice in your vehicle's operating manual. This will give you a chance to use the vehicle operating manual to find the answer to the overdrive question. While you have the manual out, checkout the required service intervals, recommended tire pressures, etc. This is a book that is often ignored, but is filled with valuable information.

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15. What does "scanning" a transmission do?

This procedure involves attaching a hand-held diagnostic computer to a terminal in your vehicle if your transmission is computer controlled. This device is then used to communicate with your vehicle's computer to determine if any trouble codes are present and to "read" the output from numerous electrical sensors that feed information to the on-board computer. All of this information is useful in determining the integrity of the electrical control system for the transmission. Scanners have become very important in the diagnostic process.
Note: Expect a nominal charge for this service.


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