I've been noticing a squeking noise when driving at very low speeds. It is intermittant and seems to be coming from the back drivers side wheel. Any ideas as to what it is and how to fix it?

 

Brake pad worn down and the wear indicator dragging on the rotor? Maybe it's not noticeable at higher speeds but when you slow down you hear it. Just throwin out a guess.

 

Yeah or the parking brake mechanism is falling apart.
Hunter10 and others. It would be very helpful if you would list your location. I lot of you live in the Rust belt where they salt the roads in the wintertime. That stuff - you might as well dip the truck in battery acid! When we try and help diagnose your problems on the truck that sort of wear needs to be considered.