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No issues with mine. I have had it for about 6 weeks/6700 miles.
 

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How do you like 10 speed?
 

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How do you like 10 speed?
No complaints so far. Seems like a pretty smooth transmission - I don't feel most of the shifts. There are sometimes some small jerks as it is downshifting at low speeds, but nothing to worry about. The only thing I don't like about it is the lack of a dipstick. I would like to be able to check the fluid level periodically. I'm curious to see how the 150,000 fluid change interval works out. That's considerably longer than any past transmission and kind of surprising given the hard work that transmission does, especially given the towing capability. Hopefully it's not one of those things that breaks as soon as the warranty expires.

I tried the tow/haul mode when I was towing my flat bed trailer but got a little annoyed at the downshift to 6th gear and use of the exhaust brake every time I slowed down. I did not need the extra braking power for an empty trailer so I went back to regular driving mode. Probably won't need tow/haul mode unless I am pulling something really heavy.

I took the truck on a 5,000 mile road trip towing my trailer and it was an absolute joy to drive. Lots of power and really smooth. My old 7.3 towed just fine, but it seemed like it had to work a lot harder than this new 6.7. Everything seemed effortless. I guess that can be expected when you have almost twice as much power!
 
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