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1981-1986 GMC C10 K10 C/K Dual-Pass Transmission Fluid Cooler Trans Oil Cooling, Squarebody C15 C25 C35 K15 K25 K35 l Model PJ make-packard-model-twin-six-year-1929Get that Oil Cool and Flow Clean Fluid Through Those Transmission Lines to your Radiator without worry about excessive Heat being your Transmissions worst enemy. Zirgo Transmission & Fluid Coolers Prevent Your Engine Oil and Transmission Fluids From Reaching Their Limits. At high temperatures, engine fluids can create a varnish on critical engine and transmission components, harden seals, cause transmission plates to slip, and cause transmission