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2020 F350 Dually 6.7 liter diesel 10-speed auto trans
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Discussion Starter · #1 ·
While not towing, economy mode, interstate driving, cruise set at approx 65 mph. My 2020 F350 DRW (4.10 ratio) mysteriously downshifts from 10th while on level (or even downhill) grade. Foot off accelerator since cruise is set. After a quarter mile or so, upshifts back into 10th. Has anyone else experienced similar performance? Thanks!
 

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It should shift down to maintain speed on downhill slopes. Level? Not so much....
 

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2020 F350 Dually 6.7 liter diesel 10-speed auto trans
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4 Posts
Discussion Starter · #7 ·
It should shift down to maintain speed on downhill slopes. Level? Not so much....
The downhill events I'm referencing are slight and short (interstate overpass bridge). Speed was not noticeably increasing to the point where anything other than slightly reducing the throttle seems necessary to maintain speed.
 

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Could be still learning how you drive. I'd not sweat it unless you really can see/feel other problems.
 
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