I have a 46 2-ton and it has a non synchromesh GKT 134 in it. This was a transmission made by Chevy, not Muncie like the SM420. When I was doing research on it I was able to find a gasket kit... That was about it. Once I pulled it apart I was able to take the bearings up to our local bearing store and they were able to order in new bearings.
Thats all the info I had found!
