. My truck is a 2013, 6.2L, Super Duty. When I accelerate slowly from a stop, I feel a slight shudder for just a fraction of a second. Once the truck is moving, all is well, runs great, tows well, no loss of power. I had the dealership check it but the mechanic that drove it said he couldn't feel anything unusual. But, every time he took off, he put his foot in it and that's not the way i drive it.
The computer didn't show any engine codes. Also, I can operate the accelerator any way I like, in neutral or in gear with my foot on the brake, and I don't feel any shudder or shake at all, only when I take off slowly from a stop.
I've just about narrowed it down to the transmission, like it doesn't shift to low completely until the truck starts moving.

Anyone experience anything like this?

 

If I start out slow what I feel is the transmission shifting into 2nd shortly after it starts moving that could be what you are feeling. If you haven't already done this set your information display up so it shows what gear you are in and see if that's whats happening. I have also found that driving it a little harder doesn't seem to hurt the mileage and it keeps it in 1st a little longer and gives you a big .

Denny

 

I thought about that also. I feel it usually before it shifts into 2nd.

 

See the 2011 super duty tranny problem thread.

 

That doesn't seem to apply to my truck. There is no "slippage" during shifting between any of the gears, only what feels like a slight hesitaition when starting from a dead stop. I think the first step is going to be to get a tech to actually feel it himself. I'm taking my van for an oil change this AM and am going to ask if there is a 6.2 that I can drive, just to make sure I'm not imagining this.

 

Could it be rear axle wrap? I wouldn't think a new rig would do it, but my '08 is bad. Needs new springs.

 

I was thinking the same thing, My Nissan Titan 2wd did it for 122,000 miles the whole time I had it. I can feel it in my Super duty a little sometimes just as you describe. As the torque is applied to the axle it rotates and you feel the slip joint on the drive shaft as it moves, or in some cases shutters a little.

 

Does it get worse under a heavy load?

 

I have noticed this as well. Still in 1st.

Have not brought it to the dealer yet.

 

I would put your truck in the manual mode and shift it from 1st to 2nd and I would bet that it's not there. I think it's just the normal operation of the transmission under a very light load. What your describing sounds just like what mine does under light load, if you give it a little more gas it goes away.

Denny

 

Doesn't seem to matter if I'm towing or not. Also, it bever happens between gears when shifting. Once I leave a dead stop, it doesn't happen again. I'm thinking either a transmission issue or slop in the drive train somewhere. I talked to my service writer this morning and he said he has a master mechanic that he's going to get to look at it.

 

I paid really good attention today while taking off, no doubt what I'm feeling is the spline shaft not moving smoothly due to axle wrap...hence the shutter.

Like I said my other truck did this...no worries.

 

How about defining axle wrap. I don't know what that is.

 

Axle wrap occurs when the rotational force of the tires causes the axlehousing to twist or rotate. When this happens the length of the drive shaft changes, the spline shaft/slip joint on the drive shaft allows for this change in drive shaft lenght. Any friction in the spline shaft as in moves in and out can cause a jerky feeling. This is nothing new and has been talked about on many forums on different makes and models. Some have taken the spline shaft apart and lubed or add grease zerts.

Google is your friend or watch videos of this on youtube... give it a try