They actually used both. The T-type uses shims and the VA-type uses a star shaped adjustment nut....just like the front diff. Both are still considered R160s, but not much is cross compatable betweeen the two.Good advice on rear pumpkins.
I had always wondered if Subaru used shims or adjustment nuts.
Yep I kept my bearings on the carrier. Went just fine.Yup...exactly the way you should do it. Pull both diffs out of the housings, swap the ring gears, and put the LSD into your OBS housing. While it's always good practice to change the bearing races to keep them with the bearings that originally came with....I've found the Subies to be pretty damn tight on tolerances......tight enough that I've had to make a change in 1 diff out of 6-7 that I've done.
Check things first, change if necessary.