2015 Dana DSP40, Truck Tractor, Rear Rears (Tandem Rear or Single), Fits to: Kenworth T680, (Used) 2015 Kenworth T680, REAR DIFFERENTIAL GEARS ONLY- Part Number: 511329, Make: Spicer, Model: DSP40, Ratio: 3.55, Capacity: 20,000 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 3.55, Serial# TBD, Truck Year 2015 1XKYD49X4FJ449980