Hey all, i've been lurking for a while and this is my first post. I've got a 2004 Fx4 supercab. Here is my problem: When i turn right into driveways, around corners etc, there is a knocking sound that comes from under the bed of the truck. I cannot find what it is. I have done the obvious like make sure the spare is snug, i've shook and rattled the exhaust and from what i can tell that is not what it is. It is weird, i only hear it when turning right.

Any help?

 

Spring shackle bushings might be worn letting it pop. Do you have limited slip diff? If so that might be popping, maybe clutches need looked at. Just a couple of possibilities.

 

basically same as kd4crs said.
I would put your tail gate down and have someone push down on each side and you listen around the leaf's. If all is quiet, then it may be your clutch packs binding if you have the limited slip differential and it only happens when you turn sharp from a stop. My 05 had to get them replaced for similar issue.

 

I to have that same noise . Had it since I purchased truck at 6000 miles now with 98,000 it still makes that noise . I`ve checked all areas of the truck. I just learned to live with it. If you find it let us know.

Oh! Welcome

 

Thanks for the input.