; HomeHeavy Duty Truck PartsDifferentials & Differential PartsRear Rears (Tandem Rear or Single)Spicer/DanaRS404Used 1999 Spicer/Dana RS404 Rear Rear (Tandem Rear or Single) Used 1999 Spicer/Dana RS404 Rear Rear (Tandem Rear or Single) Unfortunately this part is temporarily unavailable. View other Spicer/Dana RS404 Rear Rears (Tandem Rear or Single)