There is information "out there" on swapping a torque tube rear end from something like a '48-54 PowerGlide equipped car. From what I remember, it is a pretty straight swap. I might have a text file with the instructions somewhere. That will allow you to keep the torque tube but have a 3.55:1, and stay away from the installation difficulties of swapping the ring and pinion only.
-Tim
'51 Chevy 3104 w/'56 235, 848 Head, HEI Dizzy, Corvette Cam, Split Manifold and Dual Carter YF's
| 
