View 8 Photos View 0 Videos Eaton RS521 Rear Differential $1,250 USD Good used Eaton RS521 Rear, Rear Differential Assembly. 6.17 Ratio. 90 day guarantee for swap or refund ConditionUsedRear End6.17 ratioFits To Make(s)EATONFits To Model(s)RS521Stock NumberRyd RS521/6.17/36 MLS Number14164842CategoryDifferentials, Rear Last Updated2/26/2026 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info