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1936-1938 GMC T155 Dual-Pass 20" Transmission Fluid Cooler Trans Oil Cooling, T155l Series 63 make-oldsmobile-model-f-seriesGet 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