12 0 GM/Chev (HD) Turbo 400 Transmission for a 1990 GMC STEP VAN Contact for price (Used) 1989 GM/Chev (HD) (AT), TRANSMISSION ASSEMBLY- Model: Turbo 400, Serial Number: TL3502691, Engine: GM/Chev (HD) 5.7L, Reference images for condition. For more information... ConditionUsedEngine Model5.7LFits To Make(s)GMCFits To Model(s)STEP VANWill Fit Year(s)1990Stock NumberP-98349 MLS Number13453035CategoryTransmissions Last Updated9/30/2025 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info