View 0 Photos View 0 Videos 2016 Detroit RS21.0-4 Rear Differential for a Freightliner M2 106 $908 USD (USED) Detroit RS21.0-4 Ratio: 5.88 Side Gear Splines: 41 W/ Locker: NO Cast#: R6813511005 ConditionUsedFits To Make(s)FreightlinerFits To Model(s)M2 106Stock Number25974828 MLS Number14298372CategoryDifferentials, Rear Last Updated4/9/2026 LocationDes Moines, IA, US Sold ByVander Haag's Inc. (855) 370-___ SHOWNUMBERCall Seller Email Seller Save More Info