The hi pinion uses a V6 carrier (4 pinion). Aussie doesn't make a V6 locker obviously. You can use a 4 cylinder 3rd in a hi pinion but you have to buy the conversion bearing. The downside is you'll still have the 2 pinion carrier. I put a Detroit EZ locker (V6 model) in mine. Here's a build up of mine.
http://gearinstalls.com/aaron.htmI am going to remove the Aussie in mine in the future for a Detriot. Brian Ellinger says that lunch box lockers destroy the case after a while by spreading the case apart. I haven't heard about it happening much though.
