GM 10 Bolt 8.6" 1500 Rear Axle Assembly 99-05 GM 1500, 3.73 - USA Standard

8.6" GM 1500 Rear End Axle Assembly, 3.73 gear ratio. Standard Open Differential (Opt GT4) fits model years 1999-05 2WD, fits model years 2005 4WD. Replacement rear axle assemblies from USA Standard come complete with all differential components in one part number for easy, bolt-on installation.