i have a 1990 cherokee with the aw4 with 35s and manually controlled electric fans i can not figure out why it tends to overheat under a load for long perionds of time. i driving down the road like a normal car it stays coool When i wheel and rockcrawl it stays cool, the transmission line feed to the radiator, could the transmission fluid be getting to hot and the radiator cant keep it cool enough, or could my torque convertor be slipping, does anyone have any ideas what could be going wrong