I put about 2000 miles on the diff. It about $2300 in parts and another $500 in labor. The diff oil was change every year and after broken in.
Kaaz 1.5 way LSD
M-Factory 4.44 Final Drive
Greddy High Capacity Differential Cover
Greddy Neomag Drain Plug
(whole pumpkin) $1800 willing to ship at buyer expense and it not going to be cheap