2000 Ford Ranger

Noises problem
2000 Ford Ranger 6 cyl Four Wheel Drive Automatic 135000 miles

Right hand front end loud squeaking sound.
The upper ball joints are the sealed type, they have been lubed several times with a needle type grease fitting and the sound stops for s while.
This time trying the same thing doesn't seem to work. Any other ideas other then replace the upper ball joints with new ones that have grease fittings in them?
January 10, 2010.

If they are bad, they should be replaced. How were you able to grease them with a needle it is a sealed unit?

I used a needle for the uppers and the bottoms have grease fittings.
Turned out it was the lower passenger side ball joint making the noise, I just didn't force enough grease into it. Now it is nice and quiet.
They all have been checked and are fine, just dry.

Jan 12, 2010.