1 0 Eaton RD404 Rear Differential for a 1996 Western Star 4900 $1,195 USD RDP40 RS404/ HAS LATE CASE WITH THRUST BLOCK 3.70 LOCKER WILL INSPECT IN OUR GEAR SHOP, 90 DAY WARRANTY, Ratio: 3.70 LOCKERS ConditionUsedRear End3.70 ratioFits To Make(s)Western StarFits To Model(s)4900Will Fit Year(s)1996Part NumberRD404Stock Number32225-4 MLS Number13486048CategoryDifferentials, Rear Last Updated4/1/2025 LocationUcon, ID, US Sold ByHolst Truck Parts (833) 541-___ SHOWNUMBERCall Seller Email Seller Save More Info