View 0 Photos View 0 Videos Detroit RT40-4S Rear Differential Recently Updated $1,500 USD Remanufactured Detroit RT40-4S rear, rear differetnial assembly. 2.85 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered ConditionRemanufacturedRear End2.85 ratioStock NumberBP TRS RT40-4S/2.85 MLS Number14050498CategoryDifferentials, Rear Last Updated8/26/2026 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info