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"But on the new truck they say I dont need to take it off Tow-Haul it will downshift when needed," I don't think I agree with Ford on that Statement" Yes it will downshift but the CC if left on will maintain the set speed. When I say steep grades I mean 6% or better. We had no problem going up Fancy Gap ..6% 8 miles. TH and CC engaged and EGT Boost and xmittion temps were within acceptable range. Experiment the next time you are out.
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