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I see 220F on my 96 transmission when towing up the grades with the standard cooler, and probably higher in some circumstances. I think it's important to make sure RPMs stay in the 2500+ range and the torque converter is locked. I have a switch on mine to lock the converter manually since I also use the EBPV as an exhaust brake.
Many times I've considered getting a larger cooler, but I just wind up periodically draining the transmission pan of its seven quarts and replace it with new fluid. If/when the transmission finally gives up, I'll probably get a Brian's Truck Stop built transmission because I only use the truck for towing. At that time, BTS will add his large cooler on it.
By the way, when towing and working hard, it's not unusual for me to see 220F and even a bit above for the water and engine-oil temperatures. No problems so far.
Last edited by Airstreamer67; 04-24-2013 at 09:28 AM.