If it does it only at HWY speeds or 4x4'ing only, then your lift or those HUGE tires are probably putting a massive load on that auto-tranny.... transfering the heat to the rad..

If not, look at the water pump, etc... but I had to go to a 4row custom rad setup with the turbo with 33's just to "beat the heat" here in SoCal... after that..

Never looked back <img src="/forums/images/graemlins/kewl.gif" alt="" />

Jason