Spider gears my ass, about the last thing to fail. Soft faced axle shafts are probably shot. Anybody quoting you less than about $1500 for a rebuilt diff is lying their ass off and even then most of them are screwing you. Parts for a full rebuild will be about $500 & the rest is labor, unless you want a real shit job. Posi case needs polished and checked for cracks, posi unit needs replaced and tuned, and not with that spring loaded POS.
Now it could be all the other things people have mentioned, but no one goes into the diff for $400 - $500.
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