OER Parts offers a wide selection of Manual Transmissions & Parts for your 1976 GMC K25. OER Parts offers 1976 GMC K25 Bearings, 1976 GMC K25 Boots, 1976 GMC K25 Complete Transmissions, 1976 GMC K25 Flywheel, 1976 GMC K25 Gaskets, Seals & Filters, 1976 GMC K25 Gears, 1976 GMC K25 Hardware, 1976 GMC K25 Shift Knobs, 1976 GMC K25 Shift Linkage, 1976 GMC K25 OE Shifters, and 1976 GMC K25 Performance Shifters.