Down on power and shifting higher?

[Armybyrd]

This weekend I had to make a 2000 mile trip half of which was pulling a mustang on a featherlite. My 6.4 just has the *** removed with ******** tunes and I used the tow tune for the trip. Anyways the whole trip was fine except the last 20 miles or so the truck felt noticeably down on power and shifting from 2-3 would take longer and would shift at around 3-4k, also at lower rpms there was a slight sound.
After I dropped the car off the truck was back to normal. Do these trucks come with transmission coolers? I think it just got hot as it was around 90 degrees.

 

[Mark Kovalsky]

Yes, they have transmission coolers.

The transmission will shift at higher RPM when the engine is down on power. Something is wrong with the engine. Fix that and the trans will shift right again.

 

[Armybyrd]

Yes, they have transmission coolers.

The transmission will shift at higher RPM when the engine is down on power. Something is wrong with the engine. Fix that and the trans will shift right again.

Ok well the truck was back to normal once the car was off the trailer and everything seems fine now so Im hoping everything is alright.

 

[sootie]

check for a cracked uppipe.

 

[gabrielchartrand]

Do the basic and change your fuel filter.

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[djr4x4]

Setup to watch your fuel rail pressure on the screen and see what it's doing while accelerating

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