Rear Axle Kit Fits GM 8.5"/8.6" Diff 30 Spline 6 Lug LH 33-11/16 Long, 630120. WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. Rear Axle Kit Fits GM 8.5"/8.6" Diff 30 Spline 6 Lug LH 33-11/16 Long Fits GM 8.5 in. Differential 30 Spline Length 33.6875 in.Rear, 6 Lug Includes Wheel Bearing, Seal, Diff Cover Gasket, Studs, and Lug Nuts Advanced Heat-Treating Results in a Stronger, More Durable Axle USA Standard Gear® sets the benchmark for quality OE replacement parts at affordable prices. USA Standard Gear produces the widest selection of aftermarket drivetrain replacement parts on the market, including ring and pinions, axles, Perfect Fit driveshafts, transmission and transfer case components, and installation kits. Designed for the general installer and do-it-yourself customer, USA Standard Gear products provide unmatched reliability and the assurance that your vehicle is repaired for the long haul.