0 0 2014 Detroit RT40.0-4 Front Differential for a Western Star 4900 $2,118 USD (USED) Detroit RT40.0-4 Ratio: 3.58 Side Gear Splines: 46 W/ Locker: YES Cast#: R6813510705 ConditionUsedFits To Make(s)Western StarFits To Model(s)4900Stock Number25866589 MLS Number13842969CategoryDifferentials, Front Last Updated9/24/2025 LocationKansas City, MO, US Sold ByVander Haag's Inc. (855) 370-___ SHOWNUMBERCall Seller Email Seller Save More Info