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Happy to be pointed to a source for the service manual if it is on this forum already?
It does worry me too that you can't put a lot of torque on the yoke nut or harm the pinion bearings behind it, or that there is no cotter pin involved in securing the nut.
VERY involved. It's easy enough to slap new parts into the axle housing. The tricky part is getting the pinion depth correct (every one needs some precision measuring and shim-selection to get it right) and then getting the pinion bearing preload correct, which involves a new crush-sleeve or aftermarket spacer/shim system.so is it involved to replace the pinion gear? Or at that point do you look for a donor rear axle to get a new set of rear end gears?