View 0 Photos View 0 Videos 2013 Axle Alliance RS21.0-4 Rear Differential for a Freightliner M2 106 $953 USD (USED) Alliance Axle RS21.0-4 Ratio: 6.14 Side Gear Splines: 46 W/ Locker: YES Cast#: R6813511105 ConditionUsedFits To Make(s)FreightlinerFits To Model(s)M2 106Stock Number26074809 MLS Number14631848CategoryDifferentials, Rear Last Updated10/2/2026 LocationDes Moines, IA, US Sold ByVander Haag's Inc. (855) 370-___ SHOWNUMBERCall Seller Email Seller Save More Info