[b454rat]

The front you picked up is a 10 bolt, assuming it was original to the truck. The inners are gonna be different as well as the outers. I think you need to find the inners for a 73-78ish Dana 44 from a GM. Since your original axle is drum, uses a different length outer....the u-joints are different size too, but from the 73-78ish they are interchangeable between the 10 bolt...