Ok, so I ripped the tranny out and apart and found yet ANOTHER mainshaft lower bearing to be destroyed!! this is the 2nd one!! the odd part is that this tranny worked fine before we touched it and it also didnt have ANY shims in it??? is that normal?? also should I be using the old 1st gear as I have read when doing a JDM ITR lsd install you have to use the JDM ITR 1st gear and counterparts for some reason?? LMK what info yuo have people... PLZ!!!!!!!