This differential master Overhaul kit from Alloy USA fits 00-04 Jeep Grand Cherokee (WJ) with Dana 44 rear axle. Alloy USA is a manufacturer of performance drivetrain products, high strength axle shafts and kits, performance ring and pinion sets as well as trick problem solving products. We specialize in Jeeps, Chevy muscle cars, Mustangs, GM, Ford and Dodge trucks. We have over 30 years experience in the performance market, and we know what works and how to make it. We also know how to keep the costs under control, so we can provide High Quality products at a fair price.