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Seems the cam is too big for the converter in such a heavy truck. The 3.73 and 80e are hurting you at your power level. I'd bet 4.10's with a smaller cam and you run a lot faster. Both time and MPH.
How tall are your tires? Is this a daily driver? 4.10s are the bare minimum. If my truck wasn't my daily, I would have went with 4.56s instead. Have you ever had it on a scale? I bet it's heavy. My truck us 4600+ with me in it and 3/8 tank.
If you do a lot of highway driving, I would not do more than 4.10s. If you think that you'll pick up a new daily driver in the near future, don't fear the gear.