OER Parts offers a wide selection of Cooling System Components for your 1964 GMC 1000 Series. OER Parts offers 1964 GMC 1000 Series Water Pumps, 1964 GMC 1000 Series Chrome and Polished Pumps, 1964 GMC 1000 Series Electric Water Pumps, 1964 GMC 1000 Series High Volume Pumps, 1964 GMC 1000 Series OE Style Water Pumps, 1964 GMC 1000 Series Reverse Rotation Water Pumps, and 1964 GMC 1000 Series Water Pump Pulleys.