Ok I have an 89 D250 with the 5.2L engine and 3 speed auto tranny. What is the tranny code? Were there lots of different ones or just one? It's 2wd, if that helps. Also, anyone who has experience with these- are they difficult to work on? Can mild slippage be fixed without a total rebuild? It looks like I will have to remove the front part of the exhaust just to get the pan off, but I could be wrong. Responses appreciated!