Transmission Repair
 
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Transmission Troubleshooting
Transmission Adjustments and In-Car Repairs
  There are several problems that can be resolved with an adjustment (A simple adjustment is one that can be made without removing the transmission from the vehicle.) or minor repair.

  If a late model transmission (computer-controlled transmissions started becoming popular in the early '90s) is not shifting properly, it is often the result of a computer sending
incorrect signals due to a faulty sensor, or the transmission is not reacting to the computer command because of a bad connection or defective solenoid pack.  These problems can be corrected while the transmission is in the car for considerably less money then a complete overhaul.

  If a non computer-controlled transmission is shifting too early or too late, it may require an
adjustment to the throttle cable. Since throttle cables rarely go out of adjustment on their own or due to wear and tear, these mis-adjustments are usually due to other repair work or damage from an accident.  If the vehicle has a vacuum modulator instead of a throttle cable, there is an adjustment that can be made using an adjustment screw in some modulator designs.  In vehicles with modulators, however, it is very important that there are no vacuum leaks and the engine is running at peak efficiency. Engine vacuum is very sensitive to how well the engine is running.  In fact, many technicians use a vacuum gauge to diagnose performance problems and state-of-tune. Many problems that seem to be transmission problems disappear after a tune-up or engine performance related repair was completed.

  In some older transmissions, bands can be adjusted to
resolve "slipping" conditions.  Slipping is when an engine races briefly when the transmission shifts from one gear to the next.  There are no adjustments for clutch packs however.
  The first thing you should do when you suspect any transmission problem is to check the transmission fluid level and condition.  The engine should be running with the transmission in "PARK."  With Chrysler products, check level with the transmission in "NEUTRAL" with the parking brake set and engine running.

Tip: Always insert the dipstick 2 or 3 times, look at both sides, and check for a consistent reading.

.  If the fluid level is low, fill to the proper level and test drive the vehicle.  If the abnormal symptoms are gone, your primary problem is a leak.  Continue to monitor the fluid level, add as appropriate, and have the leak source diagnosed before additional problems occur.  NOTE: A slow leak is worse than a big leak!  A slow leak will allow the transmission to operate until the level is low enough to subject the unit to low fluid operation which will cause excessive wear!  A big leak will certainly get your attention and usually results in little or no internal damage.
1.  The transmission 'falls out of gear' when making sharp turns, fast stops, or starts.

2.  Delayed engagement into Drive and/or Reverse, especially when cold.

3.  The engine 'races' between shifts.
Automatic Transmission Abnormal Symptoms :
Transmission Troubleshooting - Tips - Repair for Manual & Automatic

Transmission Troubleshooting
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