Question about 1991 Chrysler TC

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Chrysler TC 6 cylinder... car downshifts from O/D to Drive while cruising at freeway speeds (and without accelerating). Not sure if this is something in the engine control or if it means that my transmission is going... 114K miles. Fluid looks good and have no shifting problems in any other gears... seems to only slip out after it warms up and only sporadically (once ever 20 or 30 files)...

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  • Chrysler Master
  • 773 Answers

This problem is so common is not even funny. Chrysler put out a TB on this years ago. Disconnect the battery and go under the car and clean the ground for the starter... it is shared with the TCM. If this doesn;t prevent a recurrence, then your brake switch (at the pedal) is sticking causing a downshift. Have a nice day!

Posted on Aug 19, 2017

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Posted on Jan 02, 2017

localwonder
  • 6784 Answers

SOURCE: No tranni downshift upon heavy accel

Hi, two possible issues here. the first could be a malfunctioning shift solenoid. this can affect the shifting operation. the next issue could be the transmission control model(TCM). if this fails, you will experience abnormal shifting during up and downshifting. I would check these areas as well as the fluid level as well. Some transmissions are sealed and you cant check the fluid level. if you have a transmission dip stick visible, please check the fluid level before you check the other areas.

please rate and god bless.

Posted on Mar 25, 2009

alicantecoli
  • 22133 Answers

SOURCE: cruise control and tranny problems. possibly related.

sorry the cost of the repair is more than the car is worth ,recon gearbox needed

Posted on Jan 23, 2010

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please rate and god bless.

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