Today was the first day on the beach with my new 32 bfg m/t. I used to have 31 bfg a/t, i air down to 15-20 psi usually. Never had a problem. Today with my new tires i air down to 15-20 closer to 20psi. The mud terrains are going to dig in a bit more i figured. I wasn't going fishing today just a test run up and back down the beach. When i started to come back up the beach i noticed my truck was running really hot, and i was loosing power sort-of. I was almost 3/4 way back and i really wasn't going anywhere and the engine was between 2-3000 rpm. So i stopped and went to start going again, except now i wasn't moving and i was in drive!!!! The truck temp is HOT. I get out and look in the sand, i have a trail of fluid spray in the sand as far as i can see. NOT GOOD! Check oil (looks good) check tranny fluid (non existent). Some one gives me a ride to the ranger station (thanks). Get there and call for the tow truck (jacked up f-350 old ford wrecker). Go back to my truck and wait. He shows up puts 6 quarts of tranny fluid in. told me to air down to 10-12psi and that it overheated because i had the wrong tire pressure in. I never knew tranny fluid would boil up like that. Well I drove off the beach myself and it cost me $120 for his services and fluid! I 'm due for a tranny fluid/filter change now anyway so i'll do that tomorrow. Better safe than sorry. Thanks for listening, and don't forget to air down "correct pressure does make a difference"