i just did this dude you can get a new detroit off of ebay for about 442$ with the install kit, shims all that crap, 4:10 gears 125$ on summit, then about 30-50 bucks for the oil, white lithium, that kinda crap. by the way if you cant find one on ebay check out Ring And Pinion Gears, Axles and Axle Shafts, Drivetrain Parts and Tools - Accu Auto Parts detroit true track for 444$ then like 80$ for the install kit.