Native82

Its only makes the noise at around 1800 -2000 RPM. It doesn't matter what gear it's in, i could be turning a corner and it will do it or I could be doing 70 mph on the interstate and it will do it. I have spent hours pulling and pushing heat shields, looking for anything that could be loose and vibrating and haven't found anything. I will definitely looking at what da90 said in his comment where I can't remember if I checked those fuel lines or not. I appreciate any and all ideas you guys have, I am now starting at the beginning and going to go through the truck completely again. I had one shop say they think it might be something in the transmission but seeing this has been making this noise for 6 months + it makes me wonder why it wouldn't have gone out by now. Im not even going to go in that direction until there is no other possibility. Thanks everyone, keep em coming.

In the beginning that's what I thought too but no one has been able to find any loose shrouds or heat shields. Its also particular when it make the noise, it will do it when going up an incline, it will do it if you have it hold the RPMs at about 1800 regardless of the gear its in. You can also feel it vibrate in the gas pedal when it happens.

I have a unknown noise that is coming from what seems like the mid section of my truck. I have been to the dealership multiple times without having any luck figuring out what it is. I then took it to a private garage and they swore it was the transfer case. 2k later I have a new transfer case but the noise still persists. I then went back to the dealership and they said its probably going to be the cats going bad. Soo.. 1800 later I have new cats duel exhausts and unfortunately this persistent noise. I have a video but it won't let me up load it here, so here's a link. Check it out and let me know if anyone else has had this issue. Its driving me crazy.