Originally Posted by Kamalani Mahie

I'm curious to know what the actual temp got to. I'm assuming you didn't have a scangauge going at the time so you don't know the temperature? I've been loaded down before and climbing mountains in 100 degrees but never got a high temp warning. Trans temp has gotten up into the 230s and 240s. Since you're light did come on, I would check the tranny fluid to see if it's still good. Once that fluid gets too hot it will break down and not provide the proper cooling/lubricating necessary which will result in future transmission damage and eventually failure. Get it checked ASAP.

Also one thing to note is you should climb at a constant speed in one gear. I do not use "D". Usually it's S4 or S3. That will keep the tranny from hunting and keep the torque converter locked more resulting in less heat buildup in the tranny.