My advise, for what it's worth, is that ALL Ford E4OD trans that pull any loads should have an additional cooler installed. I would also recommend a trans temp gauge. In my F350 I noticed that my trans. really got hot when going down hills with the exhaust brake on. A lockup switch on the torque converter solved the problem. The truck has over 200k miles, never a problem with the trans or PowerStroke engine.