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I have a 2008 6.4 auto. When going down highway at same speed trans will act like it shifted or hesitates. Then picks right back up. No rpm change when it happens. I thought at first it was a fuel filter plugging from the way it paused., but it seems to be in the transmission now.

It does it 4 to 6 times a day when driving all day. I have not had it happen when the cruise is on or when it is in the tow haul position.

I would appreciate any help the dealership doesn't know what to do.
Thanks
 

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mine is somewhat similar, although i have a great leap in rpms. Get on the highway, accelerate up to speed and when i let up a bit, it seems like its downshifting, leaps in rpms and then fixes itself after 3 seconds or so? Any ideas
 
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