I have been trying to get the transmission specifications/tolerance for the transmission temp. I was told by the dealer mechanic that 192 -194 is the allowable range; however, I can hit 200 just driving around and can hit 248 when towing my pontoon boat (which on the trailer is 4,000 lbs.).

I get a transmission temp warning light when towing. Have to turn off the truck and wait a while before starting up.