Quote Originally Posted by hensleya1 View Post
bjornbjorn--
The cheapest permanent solution to this is to install a cooler thermostat and have the car tuned to kick the fans on sooner. The stock T-stat doesn't open until 195 degrees (91C) and the fans don't come on until something dumb like 215 (102 C). Anything above 175 or so shortens the life of the trans fluid by half for each 20 degrees above 175.

So put a 180 T-stat in there (82 C) which may be enough to keep the motor cooler by itself with winter coming on. If not, then get the car tuned.
What you leave out is how little the engine temp has to do with the trans temps. Yes.. the trans goes through a cooler in teh side of the rad. But that has very little effect most of the time. I have a stock 195 stat and typical trans temps of 170-180. Until I get in stop and go traffic for prolonged time.