I have an 08 f-150 x-cab FX4 with only 12k on it. When i step on the gas i hear a clink come from the rear end, not a clunk, but a clink. It does this more in reverse than drive. Its annoying.. Does anyone know what this could be? Ever happen to your vehicle? Looks like i will be taking it to the dealership next week.

 

Could be a dry spline, dealer can lube it and it will probably go away.