1985 Meritor/Rockwell QR100, Truck Delivery, Rear Rears (Tandem Rear or Single), Fits to: GMC BRIGADIER, (Used) 1985 GMC BRIGADIER, DIFFERENTIAL GEARS ONLY- Make: Meritor, Model: QR100, Ratio: 3.90, Capacity: 21,200 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 3.90, Serial# TBD, Truck Year 1985 1GDP8C1Y9FV622651