I have a high pitched 'chirp' squeak in the driver's front of my 4x4 supercrew when hitting bumps. It does not do it on a gradual dip nor will it do it when I bounce the front bumper. It only happend when I hit speed bumps, potholes or heavy seams in the road. The really strange part is that it goes away when it rains. Truck dries out and the chirp comes back. I have been banging away with a rubber hammer and spraying everything with WD-40 trying to find the squeak. Any ideas anyone?

 

Sounds like a ball joint going bad. Jack the truck up and grab the tire at the top and bottom then give it a shake. If you have excessive play its the ball joint. This method will not duplicate the chirp sound.

 

That side has new upper and lower about 6 months ago. Sometimes, depending on how I park, bounching the truck bumper will make a soft version of the squeak. I am really ready to go postal on my truck.

 

Could be the kind of material that the upper control arm bushing is made of. Try using a grease gun with a needle fitting and try to grease the bushings.

 

I am not sure I know what a 'needle fitting' is. From the usage I would assume a end cap for a grease gun like a doctor's needle to stick between the rubber bushing and metal of the control arm?

 

Pulled shock off to check condition and did not have time to put back on. Squeak was in shock. I got a new set as it needed to be done anyway. What a joy it was to drive with no chirp-chirp on every bump. BTW the shocks looked good, they just were bad. Hope this helps someone else.