Hi, guys im an Aussie who purchased a 99 7.3L 2500 suburban in L.A and am in the process of driving it down to Panama, Im currently about half way in San Christobal, Mexico and to say the suburban has had problems would be an understatement. Its got 107,000km on the clock and since l.a i have replaced the following: The radiator in San Diago The tranny rebuilt it La Paz Engine seized up and rebuilt in Salina Cruz (have only driven 5 hours since the engine rebuilt and now but made the 5 hour hwy drive with ease) and now the the brakes fixed and a new oil leak repaired today and gone through about 7 tyres (my fault cause i buy ****ty tyres) but why i joined the forum was to ask you all about a problem i cant get my head around, when the car is cold the tranny works fine and all gears seem to work well but when ever i am stuck in traffic the car heats up super quickly and i cant get any power to the wheels, I have no idea why this is happening. I have read heaps online but cant find anything specific. Could i need a transmission cooler? Or the water pump? Or could there be something wrong with the fan clutch for the radiator? thanks so much for your help, Want the old girl to make it all the way down as i love the car.