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You can find all kinds of transmission temperature charts on the internet that will show that when the fluid temperature exceeds about 200F the fluid is beginning to degrade. This temp is the MAXIMUM temp of the fluid found in the transmission, which is usually found at the exit line going to the radiator cooler. The temp in the pan, which is how most trans temp is measured, is quite a bit cooler, as it has been thru the radiator cooler and returned to the pan. Thus 200 degrees in the pan, means it was alot hotter when it exited the transmission. Ideally, you want the pan temp to remain around 175 or below to insure that the highest temp remains in a safe range.
In my opinion the first best thing you can do is install a deep aluminum pan, to add additional fluid capacity to the transmission, this will allow the fluid to cool more before it is pumped back into the transmission, and a larger quantity always will stay cooler. The PML pan adds 3-1/2 qts to the capacity and radiates heat better than a smooth steel pan. You also get a drain plug and optionally a threaded port for a temp probe.
http://www.yourcovers.com/transpan_9323.phpSecond best thing you can do is install an additional cooler in the return line from the radiator. If you operate in a cold climate part of the year, you will want a more sophisticated cooler that has a thermal bypass valve to allow the fluid to heat up to normal temp before it begins cooling it. The best cooler would be one with a electric fan mounted on it.
Charles
Aluminum pan compared to stock pan
