j_mag17

Alright this has been going for about a month now. Everytime I am on an uneven road or hit a bump at about 40+ my f150 will make a really bad scraping/grinding sound. I know for a fact its coming from the back end, I just took it to my local ford dealer and they couldn't find out what was wrong with it. I was seeing if anyone here has any more knowledge about this problem. Oh and if I have any people or a load in my truck that scraping/grinding sound gets so much worse, as in the sound is louder and it does it more frequently.