HardcoreFx4

Ok my f150 has a rattling noise under it. I can hear it going down the road. And when its in drive. I can still hear it but not as bad when its in neutrul. And when i shut the door it rattles. So makes me thing its comin from the somewhere in the exhaust area. What do you all think?

Taildragger

I had the plastic oil deflector under the oil filter, over the steering rack rattle. Wedged a small piece of foam under it and silenced that slight rattle.
I suggest getting under there and start bumping things to find it.

lariatboy

Usually a rattle at idle is a heat shield somewhere, or a loose running board. As stated above, pretty easy to just crawl under or lift it while running, and start poking around.

HardcoreFx4

Yeah thats what ill do get under there. But i dont have running boards