Hi all, just got my truck XLT,CC,4x4, 4.6, 6spd trans, last week and have less than 300 miles on her. I have noticed a few times while going about 30 to 35 mph on a slight grade under light acceleration the truck will shudder\shake until I a) let off the gas b) push acc pedal down harder until trans downshifts. Has anyone else had this occur?

I'm going to run her awhile before taking it in. I want to make sure I know how to make the problem occur for the tech.

Thanks Jim

 

are you sure its the trans and not a missfire?

 

Yeah I'm pretty sure, truck runs smooth as silk other than this problem. Acts like an old ford work van I had when the trans was going out of it at 100,000 miles.

 

I have 850 miles other than a bit of a harder shift up or down have never
experienced that. I would have the dealer check it out

 

take it back...

 

PCM may need reflashed. Personally sounds like it's running too high of a gear for too slow of a speed and it's not kicking down a gear.

 

I do believe you are onto something. It does act like a manual trans in the wrong gear. I will drive it for a couple of weeks so I can re-enact the problem at the ford garage. Thanks!

 

same thing in my truck FORD said its fine ???
but its driving me crazy you have to kick it in the *** to make it down shift
09 4.6 3v 6 speed scab

 

Mine did that some when I first got it new. After a while it quit doing it. 3200 miles on it now. It has the 5.4 and 6 speed auto.

 

Hey Jim-
I've had the exact same issue since day 1, along with the hard 1-2 shifting. My 2010 Lariat has 4500 miles on it, so I'm counting the days until mine reaches the supposed 5000-mile threshold. At that approximate mileage, the xmission program is supposed to be erased and things clear up.

Please keep us all updated with your results!