Turns out the rear was original. Found the numbers stamped on the housing. Also pulled the rear cover and drained the old diff oil out, it was needing that. Counted pinion and ring gear teeth it is a 4.11. So all my running gear is original

Last edited by sstock; 01/13/2014 5:43 AM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration