Bad pinion bearings would not have anything to do with the trans issue. There were several upgrades to take care of the clutch gear jumping out of gear. In 1953, a revised clutch gear and main shaft was used with double set of needle bearings to eliminate this issue. Try looking for a good used 53 or 54 transmission for a direct fit. I assume you are still closed driveshaft correct?


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