Ford 6.7L Power Stroke Diesel :: Truck Downshifts To 4th Gear While Towing A Trailer At Interstate Speeds


Jun 7, 2016

2013 CCLB, 33,500 miles, stock emissions

While towing a 9000 pound trailer at interstate speeds (75 to 80 in Wyoming), when pulling a hill, the truck downshifts to 4th gear, boost is about 18psi, eng and transmission temps in the 230F range, EGTs around 500C or 935F. RPM increases normally to 3000 then the turbo gets very loud and boost drops to about 10psi. The truck shifts to 5th gear, noise decreases but is still present, shifts to 6th and noise goes to normal after a couple seconds and boost builds normally.

This just started today. I have about 8000 miles towing this trailer and never had this before. I have about 350 miles until I'm home so I'm headed back out. Will play around with manual mode and see what it does. I also took a video of the gauges while this happens. Audio is difficult to discern. I will try to get better audio and post when I get home.

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Here's what I got.... This only happens when:

- temp is 20 degrees or colder
- Truck has been sitting and is cold
- Trans temp under 70-80 degrees
- Only happens on the 3 to 2 DOWNshift when cold

The first few downshifts from 3 to 2 have a slight clunk/bump to them...just enough to feel it. After the first few initial downshifts from 3 to 2, it will not do it then, shifts fine and smooth. After a minutes of driving it, it will not do it until the next time it meets the list of items above. If I skip this gear manually until it has warmed up, it will not do it when returning to it.

-All other gears both up and down shifting feel good just the 3 to 2 when it does happen.

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