I have a '99 Box w/Tip, and I would have to agree with RandallNeighbour; there is something fishy here.
There are circumstances where the Tip will stay in a lower gear, but there should be no hesitation in the power delivery. If that is what is truly happening, have it checked out when you take it in for the 30k maint. The Tippers are pretty reliable, but I don't think you want to have to fix one on your own nickel if you can help it.
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