i have a 2001 f150 xlt 4.6 v8. ive had it for 2 years and its been a great truck but i was driving it tonight on the highway and after i would get off the gas i would hear some noise coming from the rear of the truck. it wasnt a squeek but more of a crunching noise. can anyone help?

 

If I were you I would go out and check the rear suspension for anything odd. This is an extremely vague question. It could be anything. :/