2005 Spicer/Dana DSP41, Truck Tractor, Rear Rears (Tandem Rear or Single), Fits to: Peterbilt 379, (Used) 2005 Peterbilt 379, REAR DIFFERENTIAL GEARS ONLY- Part Number: 511328, Serial Number: HN01723728, Make: Spicer, Model: DSP41, Ratio: 3.36, 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 3.36, Serial# HN01723728, Casting# HN01723728 1XP5DB9X95N872966