View 2 Photos View 0 Videos Dana-Spicer 21-172D Rear Axle Housing for a 2020 Peterbilt 337 $1,295 USD GOOD USED HOUSING ASSEMBLY/ LOCKER /AIR BRAKE/DRUM, Serial#: N, Hub Bolts: 10, Suspension: PACCAR LOW AIR, Brake Type: DRUM ConditionUsedFits To Make(s)PeterbiltFits To Model(s)337Will Fit Year(s)2020Part NumberNAStock Number12424-8 MLS Number13282021CategoryAxle Housings, Rear Last Updated5/15/2026 LocationUcon, ID, US Sold ByHolst Truck Parts (833) 541-___ SHOWNUMBERCall Seller Email Seller Save More Info
View 1 Photo View 0 Videos Dana-Spicer 21-172D Rear Differential for a 2020 Peterbilt 337 $1,295 USD 21-172D 4.78 GOOD INSPECTED TAKEOUT/ LOCKER LOW MILE 90 DAY WARRANTY EXCHANGE, Core Charge: 500.00, Ratio: 4.78 ConditionUsedRear End4.78 ratioFits To Make(s)PeterbiltFits To Model(s)337Will Fit Year(s)2020Part Number21-172Stock Number12424-4 MLS Number13282016CategoryDifferentials, Rear Last Updated6/13/2026 LocationUcon, ID, US Sold ByHolst Truck Parts (833) 541-___ SHOWNUMBERCall Seller Email Seller Save More Info