Nevermind lol I didn't see anything loose when i first heard it, that or i didn't look hard enough. I was pulling out a parking lot hearing the noise, next thing i know it stopped. My girlfriend looked behind the truck and what, to me, looked like a small skid plate was laying the in the parking lot. Im guessing it came loose (or rusted off... the previous owner did a real good job keeping the rust off the bottom of the truck lol) and was rubbing against the drive train. Thanks though!