I'd like to replace the rear end in my 1977 F150 2x4 with one that originally came with the truck. Years ago my Dad put one in for more power to pull his 5th wheel. The truck originally came with a 2.75, now I have a 3.7. It has a tag on it so I'm told it's the whole package. I thought if anyone wanted wanted to swap it'd be so much easier than trying on my own to find one. I'm new to this truck owner stuff so hope I'm going in the right direction. I'm in Maple Grove.