Chrysler 9.25 infos : is all pumpkin and gears interchangeable ? For ex from 1974 to 2000? From a bodies..ram vans , dakotas , rams , durangos ? If yes or not whats the difference , rebuilding my 76 duster 9.25 buts its empty and i have a dakota rt and a ram 2001 9.25 un-open in storage