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Chris,
IMHO the first thing you should do is get gauges: exhaust gas temp(pyrometer), turbo boost, and transmission temp if you don't already have them. Our 2980 is slightly heavier than your 2955 but not that much, and that's a lot of weight behind your truck. Once you see what your engine is really doing, you can start making more informed choices about where to go from there. I think you'll be surprised.
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