2007+ Jeep Wrangler JK Transmission CoolerPosted in How To: Transmission Drivetrain on July 1, 2011
Last year, 88,000 JKs were recalled for potential automatic transmission overheating. You might think that the fix was to install a transmission cooler or some other mechanical upgrade to better control the transmission temperature. Nope. When you roll into your dealership for the recall, they install a trans temp idiot light, and they instruct you to pull over and park your Jeep if that light ever comes on. Right.
For right around $50, we came up with a solution that we feel a whole lot better about: adding a Flex-a-lite transmission cooler. Part number 4118 fits nicely behind the grille, and with a GVWR rating of 18,000 pounds, it’s more than triple the cooling capacity that a JK should ever need. This cooler is made in the U.S. and features Turbulators—twisted inserts that increase heat transfer from the ATF to the copper tubes and cooling fins.
The Flex-a-lite cooler included push-tie mounts, barbed fittings, hose clamps, and a length of rubber hose. To mount it in a JK the way that we show here, you’ll also need two 3⁄8-inch fittings with barbed ends on both sides, two extra hose clamps, a couple of more feet of 3⁄8-inch rubber tranny cooler hose, and about three feet of steel strapping. Fitting the cooler to our Jeep was a snap, taking just over two hours, and that was with custom mounting work for a super clean installation. Even if your JK wasn’t affected by the recall, this is an easy and inexpensive upgrade that can extend the life and performance of your automatic transmission.