I really don't know how that locker broke.
I have been running Ez-lockers (when they still made them) and lock rights in Toyotas and Samurai's for years, beating the crap out of them and have never broke anything. From what I hear the Aussie lockers are tough too.
I have never run dual transfers though, that might be the difference. That's a lot of torque multiplication for any axle to deal with.
Might be time to upgrade to the V6 rear? It's much better built than the 4 cylinder case. Good luck.
Black 95 4runner--Gone to (hopefully) a better home in Kansas
Red 88 toyota mini truck--the radio flyer/ tricycle
Silver 01 cherokee--My so called 'Expo Rig'
Black '12 Jeep JK--I'm not allowed to be alone with it...
wanna go wheelin? luke 963-8998