D100 rearend in A body

I've got a 70ish D100 8 3/4 that I am going to swap into my 88 D100. I got a pair of 8 3/4 axles with the 5 x 5.5 bolt pattern from a member here so that I don't have to swap the wheels that are already on my truck. I think the 74 Power Wagons were the ones that had the 5.5" bolt pattern. The big axles that I got are the exact same length as the ones in the older D100 8 3/4. I'm going to swap the brakes off of the 9 1/4 that I'm yanking out of the truck.