it is actually my brothers car. he has a 72 chevelle and put a 68 gto rear end into it. but when he got to the offset universal, things just didn't line up. we went to the store and purchased a new set of u-bolts, but they were the same length, and still too short. there arent any threads in the pinion yoke either, so thats not the situation. i am just so confused on this one.