View 0 Photos View 0 Videos Detroit RT40-4S Rear Differential $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 ratioFits To Make(s)DETROITFits To Model(s)RT40-4SStock NumberBP TRS RT40-4S/2.85 MLS Number14050498CategoryDifferentials, Rear Last Updated12/18/2025 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info