; HomeHeavy Duty Truck PartsDifferentials & Differential PartsRear Rears (Tandem Rear or Single)Meritor/RockwellOtherUsed 1993 ROCKWELL R20-145 Rear Rear (Tandem Rear or Single) Used 1993 ROCKWELL R20-145 Rear Rear (Tandem Rear or Single) Unfortunately this part is temporarily unavailable. View other Meritor/Rockwell Other Rear Rears (Tandem Rear or Single)