Make sure your bolts are not too long. The threaded hole in the boss on the transmission case is blind. If the the bolt is too long and you tighten the bolt and bottom it out, it will break the boss free of the case. At least that is the case on the 4 speed transmissions I have for my '37 and '42 where the bosses for the tranny and pedal bracket are broken on some of my extra trannys. I don't know the length but just measure the hole depth and thickness of the brake mount along with thickness of the lock washer and be sure that bolt isn't too long.

Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix