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 InstallCompatibility Chart?? For 1973-1995 Chevy/GMC 3/4 1 ton 2WD/4WD Rear For 1975-2000 Duallie 2WD/4WD Rear For 1988-1999 Chevrolet Suburban 2500 3/4 ton 2WD/4WD RearPackage Content?? 1x Rear Aluminum Differential Cover with Gasket Bolts W/o Product Instruction??