Hey if it’s cast iron has a 7 bolt side cover 3 shifter shafts that’s a Saginaw, there are 4 different ones. On The input shaft there are rings ground around the shaft. It goes 0 rings 1 ring, 2 rings, 3 rings. And this will tell you what the gear ratios are. I just rebuilt one for my 55, it’s easy. You can get a rebuild kit on line for under $100. You find info on the numbers online, I was looking then figured it really doesn’t matter. Thanks keep on truckin
