(Used) 2005 Sterling ACTERRA, COMPLETE REAR DIFFERENTIAL- Part Number: S11-17627-643, Serial Number: AVA04198336, Make: Meritor, Model: RS21-145, Ratio: 6.43, Capacity: 21,000 Lbs, Hub Bolts: 10, Brake Type: Disc, Suspension: Leaf Springs, Reference images for condition,