Just to make this long story short, here is my ?. Towing 5er about 15k, my temps highway speed stay around 150. Pull off onto the dirt road moving about 5-10 mph my temp reaches 250 in about 1/4 mile, now going up a long hill taking it easy (toy hauler) about 15' grade maybe another 1/4 mile, the transmission starts slipping. I have it in low gear trying to keep rpms up but no luck, come to a stop. So I know I'm not in lock up this entire time but it sure seems my transmission temp went up and my transmission starting slipping pretty fast. So I let it cool down awhile, back down to a flat spot and get a running start and haul *** the rest of the way up the hill. Yes my fluid smells burnt and my transmission temp light came on. I have a ATS stage 5, double deep pan and use amsoil synthetic. transmission only has about 10k on it since installed, and have had no heating problems before this. Drove home a couple days later, had to, but no problems on return trip. ???What damage could I have done, and what should I look for. I plan to do a flush and refill, filter change etc. Any other suggestions. I'm just wondering what damage have I done here especially after all this money spent on this transmission, and why did it heat up so fast. I've also ordered a second cooler. Any suggestions or help, did I do something wrong or what. Thanks.