Information: High quality chassis partseries products. Made with high strength steel tubing for superior strength and durability. Stable performance, reliable quality and long service life Uniform thickness, no blow holes, slag, cracks, tearing, or incomplete fusion. Measured by specialized inspection tools after welding to make sure assemble hole , bushings insert, and installation sizes are proper. Professional InstallerisHighly Recommended(No Instruction Included) Alignment Highly Recommended After Install 100% Brand New and High Quality GM 8.5″ / 8.6″ Chevy 10-Bolt Ring Pinion Ratio: 3.73 Premium Quality Gear 30 Spline Pinion 1 Year WarrantyCompatibility Chart?? For Chevy GM 8.5″ 8.6″ 10 Bolt Ring and Pinion Gear Set 3.73 Ratio RearPackage Content?? 1x Ring 1x Pinion Gears