4 0 Eaton DS405 Front Differential $1,100 USD Good used Eaton DS405 Front rear differential Assembly 3.90 Ratio 90 day guarantee for swap or refund, ConditionUsedRear End3.90 ratioFits To Make(s)EATONFits To Model(s)DS405Stock NumberRyd DS405/3.90/41 MLS Number12159619CategoryDifferentials, Front Last Updated7/30/2025 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info