well I think I have a biggy. Finally got my blazer put together started her up and runs like a champ. My issue now is I was checking the 4 wheel on it, sounded like it engaged good but now I have no reverse. It had reverse before I messed with the 4 wheel and it probably has nothing to do with the 4 wheel. Im in dire need of some help. Here's what i have done with the drive train so far. I have replaced the front pinion seal, tranny pan gasket and filter/fluids and a front drive output shaft seal. PLZ HELP!!!!!