7 1/4 to 8 1/4 Swap

The drive shaft will need to be shortened. The differential yoke is further forward on the 8 1/4" axle.

Did this swap a couple years ago. You will also need to get new shock plates since the axel tubes are bigger as well as new brakes if your rear end does not have them. I had never swapped a rear end in my life and a buddy and I had it knocked out in under an hour I believe.