3 0 2004 Cummins ISX 450ST Flywheel for a Peterbilt 378 Newly Listed $120 USD Cummins ISX Flywheel, Clutch: Flat, Clutch Size: 15.5, May need to be turned prior to installation, Casting #: 3680921R ConditionUsedFits To Make(s)PETERBILTFits To Model(s)378Stock Number16067 MLS Number14030189CategoryFlywheels Last Updated12/12/2025 LocationSpokane Valley, WA, US Sold ByHigh Mountain Horsepower (833) 913-___ SHOWNUMBERCall Seller Email Seller Save More Info