2 0 Mack 673 Flywheel Housing $650 USD 673, Used, P/N 634GC5178, Core Charge: 0.00 ConditionUsedPart Number634GC5178Stock Number165496 MLS Number11661015CategoryFlywheel Housings Last Updated10/1/2025 LocationLouisville, KY, US Sold ByRiver City Truck Parts (855) 465-___ SHOWNUMBERCall Seller Email Seller Save More Info