Keep an eye out for rfs56trk here on SB. He is very quick with transmission related knowledge. I suspect he can answer without trouble.
Also, there is a transmission restorer in eastern VT (i recall) who sometimes posts on CL. I reached out to him at one point and he is a good resource. We just need to catch a new posting since I canned the POC info. I will dig through CL and my old emails. ((EDIT: try 603 440 9035. Currently posting one of his transmissions in Springfield VT))

I recently swapped to the SM319 (OD module on the SM318) on my 62 sub (235) and it is worth the time and effort. Some of the bits and pieces to restore/repair are hard to come by which will drive your price. Pay the price and you will be happy.

Last edited by Hambone; 04/04/2023 10:30 PM.

~ HB
1966 Chevrolet K-10 | Ghost: formerly Flappy Fenders | In the Stovebolt Gallery
1962 Chevrolet C10
1962 Suburban