Different people will charge different amounts, in labor alone I charge $250 to rebuild the diff, plus $50 to rebuild the traction lock and another $50 if aluminum case because a case spreader is required to do them right.
I charge an additional $100 if the gears are not OEM or FRPP OEM style gears because the rest suck to set up.
That does not include parts, gears new are usually about $175, Rebuilding a factory traction lock usually requires about $100 for clutches, $20 for the S-spring and 20 for the new crosspin. The bearing kit for the differential is close to $100 sometimes less. The bearing and axle seal kit is about $40. I insist on OEM style pinion seals because they are the best they are about $20 as well and I only use solid pinion spacer, again another $20. If you do not have a traction lock the cost on them can vary but new they are around $400
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Please do not send me messages on forums they are too hard to keep up with and I don't check in very often anymore call me at 513 898-1580 or email me alan at dirtydogperformance.com