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We have a 2018 Axis with a 6.8 liter V10 Ford engine (e350 Chassis) and have the same issue with the RPM and downshifting. Thinking it was an issue, we spoke to Ford about this. They said the redline on that engine is 6000 RPMs and that is why there is no red line on the tachometer. If the engine revs to 4000 RPMs; no worries. It is designed that way. Drove us crazy going into Death Valley. We've learned to ignore the noise (and our white knuckles).
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