1990 Eaton 19050S, Truck Delivery, Rear Rears (Tandem Rear or Single), Fits to: GMC C7000, (Used) 1990 GMC C7000, DIFFERENTIAL GEARS ONLY- Part Number: 21065S, Make: Eaton, Model: 19050S, Ratio: 4.63, Capacity: 21,000 lbs, For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921, Ratio 4.63, Serial# TBD, Truck Year 1990 1GDM7D1Y0LV508478