Nitro Gear and Axle strives to provide the highest quality differential components available. We take the steps necessary to ensure our parts are dependable. Our product range is continually growing to meet the needs of consumers for new ratios and applications. At Nitro we know differentials, and know what it takes to provide you with high quality components.
Details:

GM 8.5 Inch 10-Bolt, 30 Spline, Nitro Mini Spool
Provides 100 Percent Traction At All Times
Simple Design With No Moving Parts To Wear Out Or Break
No Clutches To Wear Out And No Posi Additive Required
Easy Installation, takes the place of spider gears
Differential: GM 8.5 Inch 10-Bolt
Axle Splines: 30
Gear Ratio: All
Material: 8620 Steel
Manufacturer: Nitro Gear and Axle
Warranty: Lifetime
Sold As Each
Fits Vehicles:
GM Cars/Trucks/SUVs w/GM 8.5 Inch 10-Bolt Diff w/Any Gear Ratio and 30 Spline Axles