I've come across a 76 3/4 chevy p/u the front axles are marked "44HD" on the top left of punkin. Is there such a thing as a heavy duty 44? Is the rear a D60? How hard would it be to swap these into a 72 Jimmy 1/2 ton with a built sb 400 and stock TH350, what are the pro/cons. I'd like to run 35" with lockers and a Doubler next spring. Any ideas on which locker. Been fixing broken CK's for years and beside a 2" lift on a 72 burb i don't have much of an idea what's best, so any help I can get will help alot. Thanks P.S. Any thoughts on a TH350 to 700R swap?