I bought the gears through SZ, had them hold the gears until I ship my diff to them for install. The diff, packed w/ A LOT of bubble rap in a (I believe) 30-35 gal tote, was 123lbs. Through UPS, it was ~$95 to ship. I believe SZ estimates their charge in the range of $350 give or take a few $$. This covers sleeves & gasket replacement as well, not just the gear install.