The complete cylinders and the shoes are different. The only matchup is the rebuild kits for the front wheel cylinders...NAPA kit #36 for both the '51 1/2 ton and the '53 3/4 ton.
The 3/4 ton has the same size cylinders front and rear, 1-1/8". The 1/2 ton has 1-1/8" in the front and 1" in the rear.
Joe
