Re:93 yamaha big bear 350 rear diff
it really depends on what it was doing before he tore it down it could be a few different things or one thing.the gears could be chewed up,the axle could be stripped.thats the main 2 things that go out in a rear end.both can be fixed for a little bit of nothing if you shop smart.this is a pretty good site to find parts,but you'd be better getting used parts off ebay.
old school kodiak
big ol' piston
lots of balls TEAM ALL JACKED UP