GM 11.5" Rear Axle Assembly 01-07 2500 3500, 3.73 G80 Posi - USA Standard

11.5" GM 2500/ 3500 Rear End Axle Assembly, 3.73 gear ratio. Standard Open Differential (Opt Gt4), fits model years 2001-07, 1480 U/J, 1.378" CAP. Replacement rear axle assemblies from USA Standard come complete with all differential components in one part number for easy, bolt-on installation.