For a 93 or older 8.8 it would cost $110. For a 94 or newer with disk brakes, it's $135. Both of these prices are just for the labor. Any fluids or shims, if needed to set backlash, are extra. Rob has been installing gears, spools and posi units for years. Hope this helps you out. If you need, give me a call at the shop. 549-8255.