So now that my rear brakes are done I assembled my axles and installed them.
But the new Yukon axle appears to have been made wrong. The back of the wheel studs actually rub against the wheel cylinder.

I thought at first i was going to have to clearance the back side of the studs just a tad but then I installed the other side with the original axle and saw there is a huge difference in clearance.
Before you ask I made absolute certain my axle bearings are pressed on all the way to the shoulder on the axle. Also i made sure the bearings were fully seated in the axle housing.

Tried to measure the difference between the new and old axle but is difficult with the bearing and retainer plate in the way but there is somewhere between a quarter and a half inch difference.
So now i am screwed.