2000 Spicer/Dana RS404, Truck Tractor, Rear Rears (Tandem Rear or Single), Fits to: Peterbilt 379, (Used) 200 Peterbilt 379, COMPLETE REAR DIFFERENTIAL GEARS ONLY- Part Number: 127608, Serial Number: 319974, Make: Spicer, Model: RS404, Ratio: Other, Capacity: 18,000 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 Other, Serial# 319974, Casting# 319974 1XP5DU9X8YD512903