The factory transmission oil cooler for the Wrangler (JL) & Gladiator (JT) is definitely undersized and just enough for daily driving. Add in modifications like oversized tires, roof racks, etc, the transmission starts to get too hot. The CSF transmission oil cooler is a must have for any type of serious off-roading offering: 34% Larger Core Volume and 68% more Fluid Volume than the factory cooler, Dual Pass Core vs factory single pass design, Double the number of cooling tubes and fin rows compared to factory, Perfect for daily driving, overlanding, and off-road adventures.