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I replaced all bearings and seals for peace of mind. The factory bearings and seals already had 20k miles on them. Would they have been okay to use? I'll leave that for each person to determine themselves. For me it was worth it to spend the extra money to have all new.
I haven't installed the ring gear and new differential yet, so all I measured was the amount of force it took to spin the pinion gear by itself. According to the factory service manual it should take between 9.8 and 16.9 in./lbs. to move the pinion. That is what determined how much shimming I needed to have.
I'm no sure what you mean by no shimming required. This is the only rear end I've done so far and it would not be possible without shims. That being said, my brother has put together a few other rear ends where he used a different method where shimming is not required, however I am unfamiliar with this and do not think it possible on this setup.
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