If there is no damage to the cases I see no reason not to rebuild. I have been working on a DIY AYC rebuild but nearly gave up sourcing bearings. Anyone should be able to do it with a simple press and some gear pullers, it;s just like any diff really. The torque transfer gears come out as a cluster.
If you could ask some questions about the rebuild kit and what it comes with that would be great, it's big news if Mitsu is providing a rebuild kit now. Probably all O-rings, several concial roller bearings and their seats, and maybe the two AYC clutch packs. There is a central ball bearing / journal bearing combo that we could never source with Mitsu releasing them.
If you could ask some questions about the rebuild kit and what it comes with that would be great, it's big news if Mitsu is providing a rebuild kit now. Probably all O-rings, several concial roller bearings and their seats, and maybe the two AYC clutch packs. There is a central ball bearing / journal bearing combo that we could never source with Mitsu releasing them.