I have a broken AP1 differential just sitting in my garage. Would AP2 internals fit into the AP1 case? Also is there any special tools I need to completely rebuild it? I just need to have it finished before I break my current differential

 

The gears and LSD along with the bearings and other needed parts to rebuild are the same in both rears. The bearing caps are not the same and are not interchangable. You can install a AP2 rear in the AP1 car by using the AP1 input flange on the AP2 rear.

You are welcome to PM me for a rebuild

 

I have an complete ap1 for sale cheap
I also have an ap2 with an ap1 flange swap

Lookin to sell one or the other