FWIW, I had the 40hp tow tune on my 97. I ran that tune all the time. For my truck, the shifting and power were the best. I also had the 80 perf, whisper, fuel sipper, and lope. Even with the 80 perf, still kept it in the tow tune.
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'06 6.0 F350 CCLB KR.
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