I've seen that in the manual Tim. The sm420 has a seal in the transmission around the main shaft in front of the input yoke and I dont know why or what purpose it holds.


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