Both my 3 gen 4runner and and my father's '05 4dr Tundra are expierencing a quite obnoxious squeaking. The sound seems to be coming from the rear suspension area. Sound cannot seem to be pin-pointed. Usually heard hitting small bumps. Any ideas what this might be or how to stop it?? Doesn't sound threatening or like major mechanical issues, but very annoying to us both!

 

Shocks? Push up and down on the truck to see if you can duplicate the noise. If that doesn't do it then check the u-joints for play. Might also be bushings.

 

Have someone bounce on the truck while you look and listen. It's really the best way to find it. It could be sway bar brackets, sb links, control arms, coils, shocks, pan hard, u-joints, worn bushings, etc...