If you have not done it already, buy the NTC3 cases. They are the updated diff cases. They will free up the tranny. You will need to get a shim kit cause it will be too much play in the tranny. Also like Team_ass.4ever said, make sure you don't tighten the diff cases down too tight. Also dont tighten the little brace that holds down the drive shalf bearing next to the spur gear. When you shim the diff, put the shims in so it won't bind the diff gear and the gear on the shaft.