Okay I know there are tons of shuddering threads and I've read most (if not all) of them before making this post... I've got a slight vibration on take-off and I want to see if anyone else has this issue.
It happens only when accelerating from a complete stop and happens very shortly after putting my foot on the accelerator. It's most noticeable on moderate-to-hard acceleration. It's a quick vibration that lasts less than a second; it's maybe 3-5 feint shakes that feel
like they're moving side-to-side, similar to what you might feel if you bog down a car with a manual transmission when you don't give enough gas as you feather out the clutch.
I know there are many types of shuddering/vibrations that people are reporting and often times these threads get clogged up with people who think their issue is what the OP is talking about. So I want to clarify that my problem is NOT
one of the following:
1) Shake going to and from
a stop. I had this one already and they cured it by lubing the driveshaft slip yoke. It was a much harsher/quicker vibration than this one and it happened RIGHT as I came to or left a complete stop.
2) Shudder at much higher speeds (eg, 50-60 mph). I've read a lot of threads about people driving up an incline at speed and feeling misfires, or something similar.
3) Rough idle/misfire. I do also have this issue but I feel that it's unrelated (though I could be wrong).
I've had the truck into the dealer several times and they're completely stumped. Things they tried:
-Replace rear spring blocks according to TSB 11-9-17 (full text here
-Replace entire rear driveshaft assembly
-Replace torque converter
-Check all driveline angles with driveline angle measurement devices
They even called in the field service engineer from Ford to take a look at the truck and he was stumped too.
I feel like this might
be axle wrap-- I've been in trucks with fairly severe axle wrap and I know what it feels like. If this is axle wrap it's VERY slight.
Any ideas? Anyone else have this issue?
2011 F150 FX4 EcoBoost SuperCrew 6.5" bed (the LONG one), Build Date 5/19/2011