Has anyone else ran into problems installing a Trac Loc carrier in a standard Ford diff case? Bought a new unit from Summit and 3.50 gears and it seems the carrier is just too big to fit the case. Called Summit tech line and got "we never heard of such a thing". The case is from a '69 Torino and had an open carrier with 3.90 gears. This thing has become a very expensive nightmare!