I just purchased my 2011 FX4 Supercrew last week. Love the truck, huge upgrade from my former 08 FX4.

I use the truck for work. At times I will put 2000-2500 lbs in the bed and the back seat. I loaded my new truck this week and when accelerating from a dead stop the entire truck shakes/vibrates until I get up to 15-20 miles per hour.

Any ideas? When it was loaded the front and rear sat perfectly level. It almost seemed like the transmission was "shuddering".

 

I would load it up as you normally do and bring it to the service department and let them check it. If I where to SWAG it I would say you may be right with the tranny but I have seen bad rubber cause similar stuff.

 

It could be axle wrap up on intial take off. What I mean is the rear pinion wants to try and rotate up causing the truck to shake until you get up and rolling from a standing start. This is more common on lifted trucks and such....It was a big problem on earlier F150's and some still have it, loaded or unloaded. Have them check the pinion angle of the truck when it's loaded and unloaded. Ford has a TSB for checking pinion angle of the truck for vibration when taking off. Like I stated earlier, it was mostly on the ealier F150's but some still do it...they also have a TSB for Torque Converter shutter on the newer trucks. I'd have them check both.

 

Thanks guys. I figured I should load it and bring it in and have it checked. My 08 was smooth as silk, loaded or unloaded. All this shakin' can't be good.

 

Here are some TSB's to look at...hope these help some.

TSB 09-22-12
11/16/09
SHUDDER/VIBRATION ON MODERATE TO HARD ACCELERATION
FORD:
2009-2010 F-150

ISSUE
Some 2009-2010 F-150 vehicles may exhibit shudder/vibration on moderate to hard acceleration.

ACTION
Follow the Service Procedure steps to correct the condition.

SERVICE PROCEDURE
Adjust the rear axle pinion angle using the appropriate axle shim kit. Refer to the Instruction Sheet provided in the kit which provides installation procedures and Driveline Angle Corrections Chart.
The concerns described in this article mainly occur only when the vehicle is loaded with cargo or towing a trailer. The following are key points when resolving the concern.
^The vehicle must be evaluated in the state when the complaint occurs in order to verify the concern and validate a successful repair.
^If pinion angle is being adjusted to compensate for a loaded or trailer tow condition, there is risk that a vibration may occur with the vehicle unloaded.
^Verify suspension is not modified from the original configuration. Aftermarket leveling kits and rear leaf spring shackle kits change ride height which affects pinion angle and other critical driveline related operating angles. Vehicle must be at original specifications before accurate evaluation and diagnosis can be performed.
NOTE FOR 2 PIECE DRIVESHAFT EQUIPPED VEHICLES IT MAY BE NECESSARY TO ORDER THE CENTER BEARING SHIM(S) (3 MAXIMUM) AND BOLTS.

NOTE HEAVY DUTY REAR AXLES HAVE 7 LUG NUTS.



TSB 10-6-6
04/12/10
4.6L AND 6R80 TRANSMISSION - TORQUE
CONVERTER SHUDDER - 30-35 MPH (48-56 KM/H) -
BUILT BETWEEN 6/1/2009 AND 11/1/2009
FORD:
2010 F-150
ISSUE
Some F-150 vehicles equipped with a 4.6L engine, 6R80 transmission and built between 6/1/2009 and 11/1/2009 may exhibit a shudder which is felt during low speed, light throttle acceleration between 30-35 MPH (48-56 Km/h). The shudder/vibration event occurs typically when the vehicle downshifts and then is followed by a light throttle tip-in.
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
1.Perform a vehicle road test to verify the condition.
a.If the condition can be verified, proceed to Step 2.
b.If the condition can not be verified, discontinue the procedure and follow normal Workshop Manual (WSM) diagnostics.
2.Follow WSM, Section 307-01 to replace the torque converter.