What would cause the truck to slip out of park and go into reversewhile at a nor on 1995 Dodge Ram 1500

while at a normal idel,was prepairing to jump starta chevy s-10 the Dodge slipped out of park into reverse all by it self. HOW? and why would that happen?

1 answer
your transmission may be slippin cant exactly tell you from here but i recommend you to have a diagnosis check on your transmission