$300-500 labor a diff. is common around here. idk why you guys prices are so cheap. my friend owns a local offroad shop around here so i get them for really cheap. but my friend got quoted $1200 for front and rear gears, parts and labor, on a 1999 tj. they will do it a lot cheaper if hand them the third member or axle out of the truck.

87 22R PU, 2? body lift, 33? BFG muds, 4.88's, F&R Lock-Rights, Rancho Shocks, EB's Street RV Head w/ 268 Cam, LCE Header, 2" to 2 1/4" exhaust, Flowmaster 50 series, Magnaflow high flow cat, complete Herculined SR5 interior, V6 BB, MC, and calipers.