fj62 with a 1hd-t/h55 3.73 gears and 32x11.50 at's. some armor, but not real heavy. i just replaced the fluid in the fan clutch with 10,000 and i have a new radiator. my shroud could probably use a little work, but other than that everything is in pretty good shape. the 1hz i had in it before also did this, so i think it's an issue with something other than the engine. it starts heating up on the highway when driving over 60mph. never a problem when driving slower than that. today i was driving about 65mph and closely watching the gauge and the temp shot up into the red and then came back down shortly after i let off the pedal. (maybe a bad ground/gauge or something related) do these engines require better than stock cooling? would improper heater hose routing cause this kind of problem? i have a preturbo pyro and egt's have never been above 1100.