1 0 Isuzu R040 Rear Differential for a 1999 GMC W4 Contact for price (Used) 1999 Gmc W4, COMPLETE DIFFERENTIAL GEARS ONLY- Make: Isuzu, Model: R040, Ratio: 5.125, Capacity: 11,020 Lbs, Hub Bolts: 6, Brake Type: Hydraulic Disk, For more information about this... ConditionUsedRear End5.12 ratioFits To Make(s)GMCFits To Model(s)W4Will Fit Year(s)1999Stock NumberP-63873 MLS Number12422157CategoryDifferentials, Rear Last Updated12/19/2023 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info