KenReno

Hi all,

New to the forum!

I have bought a beautiful 2005 F150 XLT that has an interesting shutter. First of all, the truck has only 15K miles, is in mint condition, and looks awesome with a 4" lift kit and oversized wheels.

The shutter is only noticable when the engine is cold and the speed is roughly 40-45mph. After it's been driven awhile, no shutter. The vibration is very evident through the steering column and can be felt on the passenger side as well.

Any idea what this could be? Is this normal for a 5.4L Triton engine?

Thanks!

847alexc

Hmm... I have a couple of thoughts:

1) Was the speed sensor/computer reprogrammed for those big tires? If not the transmission would be upshifting too soon, causing that sort of shutter, which is not good for the clutches either. Check the speedo against a friends car driving next to you.

2) Are the tires properly balanced? Often those large tires can be tough to get balanced properly causing a distinct shimmy and improper wear.

3) alignment issues related to the lift, was the vehicle realigned after being jacked up. A tire shop could check balance and alignment at the same time easy.

4) Finally, however unlikely at 15k, drive shaft issues. Speed dependent shutters are often caused by bad u-joints (unlikely at 15k) or improperly balanced rear drive shaft (more common from factory). The latter is more difficult to diagnose, check 1-3 first.

KenReno

Thank you!

I'll check into 1-3 ASAP.

Rd hawk

dont forget torque convertor shutter its common on fords and very easy to repair