Trans cooling

I agree with all posts on the torque converter being unlocked in stop and go traffic causing a "fluid coupling" rather than a direct mechanical lock up. You need to watch your tachometer to see how the extra rpm is reduced as the torque converter locks. Read the owners manual, my 05 states to put the tow haul button on and pull the shift lever into D2 when going up steep long grades. This forces the torque converter to remain locked as long as the speed is above 30 mph. My aftermarket personally installed temperature guage in the output line from the transmission shows me instaniously what the temperature is doing. When the torque converter locks the temps come down immediately. In stop and go traffic there is no way to lock the torque converter so temps will rise. After 230 for prolonged periods I begin to worry and look for a pull off. Putting the transmission in Park stops the fluid movement through the output lines and cooler, thus temps will not come down. Leave it in Neutral and run the engine at fast idle as long as you can, this cools the fluid more quickly.