Plymouth Repair: transmission shift problem, plymouth voyager, shift problem

Question
Hi pete i have a 1989 plymouth voyager the van starts great but when i drive down the road it will not shift up to third gear i stop restart the engine then its ok but somtimes it just drops down when i am driving along without me slowing down thanks eddie ps i live in england and how would i get any parts it may need

Answer
Hello eddie
This is in the compuiter u will have to bring it to a tranny shop so they can reprogam the compuiter this is why when u shut it off it will reset the compuiter and shift ok. What is happeing the compuiter is louseing mem.
please rate my serivice
pete