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1973-1980 GMC C/K Dual-Pass 20" Transmission Fluid Cooler Trans Oil Cooling, Sierra, Classic, Grande, High, Street Coupe, C7D042, C7D064, C7D044, C6D042, C6D062, C5D042, C6D044, C2500, C3500, C1500, C7000, C6000, C5000l 541 make-morgan-model-plus-4-year-1955Get 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