OER Parts offers a wide selection of Manual Transmissions & Parts for your 1988 GMC Truck. OER Parts offers 1988 GMC Truck Bearings, 1988 GMC Truck Boots, 1988 GMC Truck Complete Transmissions, 1988 GMC Truck Flywheel, 1988 GMC Truck Gaskets, Seals & Filters, 1988 GMC Truck Gears, 1988 GMC Truck Hardware, 1988 GMC Truck Shift Knobs, 1988 GMC Truck Shift Linkage, 1988 GMC Truck OE Shifters, and 1988 GMC Truck Performance Shifters.