OER Parts offers a wide selection of Manual Transmissions & Parts for your 1951 GMC 250. OER Parts offers 1951 GMC 250 Bearings, 1951 GMC 250 Boots, 1951 GMC 250 Complete Transmissions, 1951 GMC 250 Flywheel, 1951 GMC 250 Gaskets, Seals & Filters, 1951 GMC 250 Gears, 1951 GMC 250 Hardware, 1951 GMC 250 Shift Knobs, 1951 GMC 250 Shift Linkage, 1951 GMC 250 OE Shifters, and 1951 GMC 250 Performance Shifters.