OER Parts offers a wide selection of Manual Transmissions & Parts for your 1974 GMC Truck. OER Parts offers 1974 GMC Truck Bearings, 1974 GMC Truck Boots, 1974 GMC Truck Complete Transmissions, 1974 GMC Truck Flywheel, 1974 GMC Truck Gaskets, Seals & Filters, 1974 GMC Truck Gears, 1974 GMC Truck Hardware, 1974 GMC Truck Shift Knobs, 1974 GMC Truck Shift Linkage, 1974 GMC Truck OE Shifters, and 1974 GMC Truck Performance Shifters.