2nd150

A sort of -rumble strip- feeling. It seems to only happen over 40 mph under light acceleration just before it down shifts. It only lasts for a second and stops. 2007 Lariat 5.4 4wd w/36,000miles
Thanks

2nd150

Bump......

zmadams

If I had to guess i would say that its just the feeling of your truck running at low RPM's. 40 MPH is like the lowest speed you can go in 4th gear and the computer wants to keep it there as long as possible so under light acceleration it wont kick down as fast and sorta "chugs" for a second. At least thats how i imagined your problem. Happens to me all the time especially when i start to go up hills and stuff

DUredFX476

i know exactly what your talking bout man but mine only does it at take off or at slow right turns and some one told me its the clutches slipping in the rearend. dont know if there is any truth to that though. good luck buddy

Execut1ve

this is going to really muddy the waters, but I get it too... speeds between 30 and 40 mph in 4th gear, 94 5.0L 4R70W trans

doug77house

I get the same thing on my 07 Lariat. I was wondering if others have had this happen. Haven't seen any post here about it. Running over rumble strips is a good description of what it feels like. I don't have a clue what causes it.

picaflor

after done everything (new plugs, new coil, clean maf, new gear oil, flush transmission, lubegard), i still have that around 42-47mph.... im thinking the driveshat maybe,.. will put a camera soon under the track to monitor that....

fend2ride

I think there is a TSB on this.. could be wrong though... could be a different issue... but if it is the same.. i think it's just a quick ride over to your local dealership and a flash of the transmission...

heres a link to the TSB

http://www.scribd.com/doc/17120405/tsb091105

rrozell

YOu are right. The ford dealship I contacted about this will reprogram your truck with the new programs. They say it is a old program problem. They want $90 to do it though...WTF no warranty coverage on a problem created by ford.

fend2ride

I'd shop around a little.. although the procedure can take some time.. if your going to do this.. make sure the complete TSB is performed by looking at your odometer and marking it... per the TSB second page.. they require the mechanics doing the work to actually DRIVE your truck...

I had this issue when i first got my truck.. luckly i quickly noticed the issue and they reflashed it the same day i tested it... problem solved.... that was before i knew about the TSB...