There is something under my truck vibrating, making a god awful sound, whenever I take off and again when I put on th brakes to slow down and get to a certain speed. I dont know what it is but it is annoying the hell out of me.
Does anyone know what might be vibrating?

 

seems like a driveshaft problem but being an 07 that shouldn't be the case. Have you done any mods to the truck?

 

yea I have a 6" fabtech lift with DL Adjustable coilovers. They are adjusted up about as far as they can go without my UCAs breakin off