I'm guessing that you have the 5.4 right? Many of the power curves I've seen show that the engine's peak torque is somewhere around 3000, after that it starts dropping off(slowly though). And yes I admit I could be a little off on this.
Also do you pull with O/D off? Some people say to not tow in O/D but my dad and many others around here have always used it and wont be convinced otherwise. My dad's truck has over 150K and he has had trouble one time but thats because he forgot he had a heavy trailer hooked up and punched it at a light. All that did was throw a code, after clearing that at a local shop it hasn't had any issues what so ever. And that is the only time that truck has ever been at an auto shop.
Another thing, all of the hot rodding auto guys I know swear by Royal purple and their trucks and tranny's have been pushed extremely hard and are still going.
just my $.02
PS: txwolf, how'd ya like pedernales falls state park?
Haha, Txwolf ignore this, didn't see you had a separate post.
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