5 0 Detroit DA-RT-40.0-4S Rear Differential for a 2020 Freightliner Cascadia 126 $2,749.97 USD (Core) 2020 Freightliner Cascadia 126, COMPLETE REAR DIFFERENTIAL GEARS ONLY- Part Number: A775350 1230, Serial Number: DDC19FZ 462653, Make: Detroit, Model: DART4004S, Capacity: 20,000 Lbs,... ConditionUsedRear End3.08 ratioFits To Make(s)FreightlinerFits To Model(s)Cascadia 126Will Fit Year(s)2020Part NumberA775350 1230Stock NumberP-66171 MLS Number12484265CategoryDifferentials, Rear Last Updated10/27/2025 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info