My87Runner

i know alot of guys on here run the A340h so hope someone can help.ok did a big wheeling trip this weekend SETO its a GA TTORA event. Anyways my trans was good and bad. When it ran good i loved it could spin the tires in the dirt and slick rock, But for some reason i can not figure out when it happens but i seem to lose all that torque i once had.

For example I was climbing a obstetrical some pretty big rocks after about a 30min ride to it and my truck would just sit at lets say 3,000rpms no tire spin could not do it. Backed off sat for about 10min watched others do it then i start the truck up to leave and felt all the power back so i tried aging and had tire spin and made it right up.

So my idea is overheating but i have a HUGE cooler and run it through my factory cooler too. I dont have a temp gauge but i just do not see how it could overheat. Here is a pic of my cooler 8inch fan with a GVW of 25,000



So what do you think it could be?overheating still or is there something else i should check?