Think I've got the same engine/tranny as Rickst29. It's a new vehicle to me and on our recent trip from Texas to Ontario I was paying more attention to the trailer than the truck.
It wasn't until about halfway back that I realized that the downshift on slight grades was not to 4th but really the torque converter unlocking. So up to then we spent a lot time with an unlocked torque converter. But it was cold and the truck does have a tranny cooler, so hopefully no permanent damage was done. A tranny flush is due at the next service too, so that may help.
My only problem with 4th is the increased noise. I think they tune these things to sound tough when accelerating.
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