1994 Chrysler Other

My Chrysler will not go into high gear if the seat belt is buckled before starting and running the car. It is an automatic transmission. I have a tach. If I start the car and run it until the door locks click and then buckle the belt it does fine until I stop and it downshifts. Then it won't go back into high gear.
Does anyone know how to fix this problem or have ever heard of it before.
April 7, 2006.

Check out the related content below while we wait for the question to be answered by a professional mechanic.