Im using my friends name in here. Anyway I have a 1990 Stepside 350 4x4 with Auto Trans. And since the body lift was put on it seems to have done sumtin with the trans. Its wont stay oin park or what not. Thanks to all that comment on this I really need some help.

You may have already figured this out, but did you extend the linkage per the instructions? It's a pain in the A#*, but that would be my guess.

yes I'm guessing that the linkage needs to be adjusted when you put on a body lift, same for transfer case.