OER Parts offers a wide selection of Manual Transmissions & Parts for your 1961 GMC 2500 Series. OER Parts offers 1961 GMC 2500 Series Bearings, 1961 GMC 2500 Series Boots, 1961 GMC 2500 Series Complete Transmissions, 1961 GMC 2500 Series Flywheel, 1961 GMC 2500 Series Gaskets, Seals & Filters, 1961 GMC 2500 Series Gears, 1961 GMC 2500 Series Hardware, 1961 GMC 2500 Series Shift Knobs, 1961 GMC 2500 Series Shift Linkage, 1961 GMC 2500 Series OE Shifters, and 1961 GMC 2500 Series Performance Shifters.