Hey guys! So on my 2003 f150 4 by 4 ive been hearing clicking noises. When i take off from the start it starts clicking then gets faster up until i hit about 30 mph then goes away. The sound is coming from the back. Whenever i goes in reverse it rattles a little bit too (not so much of the clicking). Do i have a bad u joint somewhere back there? Please help me out on what you think it is! Thank you!

 

Could be a rock in your tire. Or maybe a heatsheild that is loose. Crawl under there and check it out.