; HomeHeavy Duty Truck PartsDifferentials & Differential PartsRear Rears (Tandem Rear or Single)Meritor/RockwellRS404Used 1999 Meritor/Rockwell RS404 Rear Rear (Tandem Rear or Single) Used 1999 Meritor/Rockwell RS404 Rear Rear (Tandem Rear or Single) Unfortunately this part is temporarily unavailable. View other Meritor/Rockwell RS404 Rear Rears (Tandem Rear or Single)