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Originally Posted by Learjet
my 2006 in 4th with TM on will keep the converter locked until it is time to downshift. I tow at 65 mph on the interstate and would have to bog down below 60 before it unlocks.
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I have an 05 and mine runs the same.
If your engine or transmission is over temping and you are towing with tow mode and in 4th gear, something is not right with your truck or your tranny temp gage. Mine is lucky to reach half way even in 90 degree weather towing my 7500lb travel trailer.