6-Row Tube and Fin Transmission Cooler Kit with 10 in Fan

Universal auxiliary transmission cooler kit built around a six-row aluminum tube-and-fin core measuring 12.5 x 7.5 x 0.75 inches, with 3/8 inch (6 AN size) inlet and outlet tubes. The core is powder coated against road salt and corrosion. The kit pairs it with a 10 inch, 12V 80W electric fan (2.56 inches thick, rated up to 800 CFM at 2250 RPM, 6.6 amp draw), plus the cooler hose, hose clamps, and the pass-through mounting ties shown in the photos.

This is the add-on you install when the radiator-tank cooler alone is not keeping ATF temperature in check: pulling a trailer, a lifted truck on big tires, a 4L60E or 4R70W that sees stop-and-go heat, or a converter that slips under load. Fluid starts breaking down quickly above roughly 220 F, and cooked fluid is what glazes clutches and hardens seals. Plumbed in series after the radiator cooler, a second core like this knocks pan temperature down before it gets there. The fan matters on vehicles that spend time at low speed, where there is not enough ram air across a front-mounted core.

Install: mount the core in front of the condenser or in another spot with clean airflow, tap into the return line coming back from the radiator cooler so fluid passes through the auxiliary core last, and secure every connection with a clamp. Wire the fan through a relay with a fused feed and a thermostatic switch or a key-on trigger so it is not left running with the engine off. Top off the transmission after the first heat cycle, since the new core and hose hold extra fluid, and check for leaks under temperature.