On our automatic-equipped Jeep we needed the optional cooler to keep our transmission happy. Unlike other radiators, the Flex-A-Lite units don’t offer internal coolers. That’s fine with us because most internal coolers don’t do much anyway. Instead, this large cooler comes with the kit and is held to the XJ-specific brackets with large plastic clamshell-style clamps. On the back side, there isn’t enough clearance to get a wrench in there, so we used the old screwdriver cheat.