0 0 Rockwell RS21230 Rear Differential for a Rockwell RS-21-230 Newly Listed $1,500 USD Remanufactured Rockwell RS-21-230 rear, rear differential assembly. 6.50 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered ConditionRemanufacturedRear End6.50 ratioFits To Make(s)ROCKWELLFits To Model(s)RS-21-230Stock NumberBP TRS RS-21-230/6. MLS Number14050632CategoryDifferentials, Rear Last Updated12/18/2025 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info