My truck shifts fine and the pedal operates fine. The trouble is crusing in OD 60-80mph, I can barely give it juice and feel slight shuddering, almost like crusing slow in OD.

Could it be the TC failing? The truck has 105,000 miles

 

I checked for codes and got a "P-done" what does that mean?

 

P done means theres no codes that can be read from your odo. Probly isnt any code at all. What does your tach do during the shudder? Do the rpms jump at all even just a noticeable tad? Most likely the tc is starting to slip. Check your fluid to see if its full, smells burnt, or is not the right color.

 

No, rpms are steady and transmission was serviced 4 months ago. Today, it didn't do anything, ran fine, no jerking or bucking.

It doesn't do it all the time, maybe 2-3 times a week.

 

mine did the same thing had the tranny done tech didnt find anything but changed out convertor runs fine now