1985 Mack CRD113, Truck Delivery, Rear Rears (Tandem Rear or Single), Fits to: Mack RD686SX, (Used) 1985 Mack RD686SX, REAR DIFFERENTIAL GEARS ONLY, Make: Mack, Model: CRD113, Ratio: 5.02, Capacity: 22,000 Lbs, Part Number: TBD, Serial Number: TBD, 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 5.02, Serial# TBD, Truck Year 1985 1M2P139C2FA012806