I have a 2008 ram 2500 with a 6.7 cummins and a 68 rfe trans with 136000 mi. The problem started out as going into limp mode at around 200 degrees while towing my 7000 lb toy hauler. Originally gave me the p0871 trans code. now while towing the trans gets super hot like 240-250 degrees goes into limp mode and I still get the p0871 trans code and also a p0740 and a p0700 the local trans shop is no help and I can't seem to find a definite answer...... Somebody please help me!!!!

 

I had problems with my 08 3500 diesel 68rfe trans heating up while towing a 30ft jayco. It got so hot that that trans jammed in gear and wrecked the trans. They installed a new trans with a deeper pan and synthetic and it now runs a way cooler. The old trans would not shift. The oil smelled burnt and the high temp is a killer.

 

On my last trip the hottest mine got up to was 210F. Towing over 11K and was on a slight grade with some stop and go traffic... I have a deep pan (mag hytec).