OER Parts offers a wide selection of Manual Transmissions & Parts for your 1938 GMC Truck. OER Parts offers 1938 GMC Truck Bearings, 1938 GMC Truck Boots, 1938 GMC Truck Complete Transmissions, 1938 GMC Truck Flywheel, 1938 GMC Truck Gaskets, Seals & Filters, 1938 GMC Truck Gears, 1938 GMC Truck Hardware, 1938 GMC Truck Shift Knobs, 1938 GMC Truck Shift Linkage, 1938 GMC Truck OE Shifters, and 1938 GMC Truck Performance Shifters.