Thanks for the info, I shall check that.
The title and serial tag of my truck show it to be a '55 1st series, but it does indeed have a torque tube driveline, which causes me to wonder if the rear was changed at some point (unlikely as the transmission would also have needed to be changed and the truck has other '54 features as well), the title and serial were changed (also not the most likely due to the condition of the door tag, with factory rivets, etc) or its being built very early in the model year with some '54 parts. Thanks for the reminder on the importance of proper gear mesh, I have rebuilt many rearends, though have not rebuilt any chevy rears as yet.
The truck is running a SM420 transmission, which I intend to keep.
Last edited by G.Curtis; 09/10/2024 2:38 PM.