2 0 GM/Chev (HD) GM Hydramatic Transmission for a 1999 GMC W3500 Contact for price (Used) 1998 GM/Chev (HD) (AT), TRANSMISSION ASSEMBLY- Model: Gm Hydramatic, Serial Number: 39790, Part Number: 24208421, Reference images for condition. For more information about this item,... ConditionUsedEngine ModelV8, 5.7LFits To Make(s)GMCFits To Model(s)W3500Will Fit Year(s)1999Part Number24208421Stock NumberP-63854 MLS Number12422139CategoryTransmissions Last Updated11/25/2025 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info