Originally Posted by
VegasHB
You need to shim the top shaft to take slop out and I had to add a shim between the wing mount and motor plate to keep it from binding when tightened down. Really sloppy job from AE on the tranny body, a lot of people have had the same problem.
Before you go and do that, just make sure that all of the bearings are seated properly. When I built my B4.1 I didn't have any issues. When I built my T4.1 the transmission would barely move when the case was tightened. I took it back apart and noticed that the top shaft was sticking out 1/32" further than the idle gear and the diff gear. Here, one of the bearings was not seated all of the way. Once I got them seated properly the transmission was super free, no matter how much I tightened the case. I have not needed to do this mod at all on either vehicle. Then again I could just be lucky, but double check the top shaft bearings just in case.