; HomeHeavy Duty Truck PartsDifferentials & Differential PartsRear Rears (Tandem Rear or Single)Meritor/RockwellRR20-145Used 2009 ROCKWELL RR-20-145 Rear Rear (Tandem Rear or Single) Used 2009 ROCKWELL RR-20-145 Rear Rear (Tandem Rear or Single) Unfortunately this part is temporarily unavailable. View other Meritor/Rockwell RR20-145 Rear Rears (Tandem Rear or Single)