HD551

I am cross-posting this from NHTOC in hopes of a better response.

I have noticed in the last month or two a shudder or jerking if you will when the truck is at cruising speeds around 40-45mph. My initial thought was a bad u-joint or tranny mount (usual suspects), get under the truck give it a once over and shake both drive shafts, no play anywhere. Mount looks good on the tranny and had very little give when put under force. Tranny shifts thru all the gears fine, never been a problem anywhere. Just this slight jolt, almost feels as if the truck wants to go in and out of two gears and can't make its mind up. Could this be the case? I don't think it is anything major, but just odd to say the least.

FYI... 2007 HD N/A AWD just a hair over 20,000 miles. No performance mods/upgrades save for a K&N cold air intake.

aspenF150

torque converter slipping? Does the truck do it when the OD is off?

Slick8810

mine was doing something like that and the number 3 cylinder was miss firing so i got a tune up and its running great now. hope this helps.

HD551

I kicked the OD off, and I am still getting a similar issue either way.

Good old Bill

Am feeling this is a random engine miss. Tune up guys will half to help more as this condition is hard for the computor to detect and thro out a CEL.

Slick8810

to get mine to read out on the computer i went about 50-55mph and punch the gas until about 80-90mph then the engine light came on. So then they could get the reading on the computer