Thanks, Tim. From what I can gather, it's a 1948-1957 SM 420.(Casting number 591953 Code above casting number is D 215) I have a torque tube rear end which I plan to transplant into my '47 with the SM 420 if I can figure out what I need for the rear side of the transmission. (I can't find any numbers on the rear end but it's 6 lug and has Bendix brakes..)
