View 0 Photos View 0 Videos Rockwell RS21230 Rear Differential for a Rockwell RS-21-230 $1,700 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 Updated3/2/2026 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info