2006 Detroit RT40-4N, Truck Tractor, Rear Rears (Tandem Rear or Single), Fits to: Sterling A9500, (Used) 2006 Sterling A9500, REAR DIFFERENTIAL GEARS ONLY- Make: Detroit, Model: RT40-4N, Ratio: 3.91, Capacity: 20,000 Lbs, Part Number: C11-00006-117, Serial Number: 771AAC-A012675T, 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 3.91, Serial# 771AAC-A012675T, Truck Year 2006 2FWJA3CV56AV27507