The guy at darra, well it is actually bullock head st sumner park is ray Barnard, it is western suburbs Diffs and gearbox, whatever Steve and Nigel at Newmarket Rd Windsor cannot do for you, ray will, but just slower. Ray runs a Chev nomad wagon in top door slammer drag racing, and is very knowledgeable.
But try the guys in Windsor first, they know our R series Diffs, only thing is if the clutch plates in the limo are too far worn for bringing pre load up, you will need to get onto stew Wilkins for some plates. Btw the plates come from a isuzu rodeo ute!!