I have a F-150 lariat 4x4 5.4L 2006, am hearing an abnormal sound coming from the bottom of my truck exactly under me when I drive in 2H, I mean under the driver side the sound starts only when i step on the accelerator, the sound stops if start the 4H or 4L, i have spent most of my time the last 4 months under the truck trying to find this sound sours, the sound is like loss chin, and there is something string when I accelerate suddenly, the truck don’t lunch as it use to be. And sometimes if I shift from 4h to 2h the track powerfully chick like something hat me from behind

 

Do a search in the 04-08 forum for IWE and you will have your answer.

 

Didn't like the answers you got in your other thread ( prior to starting this one ) ?

https://www.f150online.com/forums/20...e-give-up.html

 

lol sorry but I did not know how things happen in the forums, but have an idea about It now.