Had my 73 Z28 for over 40 years. I am just now putting in a 700r Trans. I've got the trans bolted to the engine, cross member under the tail shaft, BUT... the tail housing where the driveshaft slips into is 3/4" OFF CENTER to the passenger side ! I slipped in the drive shaft, and if I leave this alone the u-joint will rap on the floor under acceleration. 3/4" is an awful lot to be off center. I checked my wheelbase, frame rail to rockers, frame rails to rear spring perches, and everything comes up perfectly straight. WHAT would make the engine/trans sit cockeyed in the sub frame like that ??? (never noticed it with the th350 being so much shorter) HELP !