serpentine belt replaced still squeals/a shield of some kind be added under car?

Noise From Synchronizer Shaft Upper Bushing on Ford Taurus The synchronizer shaft for the camshaft position sensor can cause a loud squeak or chirping noise due to failure of the upper bushing. The noise may be erratic and is usually present when the engine is warm. RepairPal Verified Average mileage: 84,333 (37,000–154,000) Engine affected: 3.0L V6 5 model years affected: 1992, 1996, 1997, 1998, 2003