2001 Chevy Silverado Squeaky Wheel

2001 Chevy Silverado, 1500 4wd. 135k miles. Front passenger wheel squeaks when rolled forward or back. Checked brakes and they are fine. While I had it apart, I could hear the squeak which sounded inside. I don’t know the terminology, but there is a bar between two rubber boots. The squeak sounded as if it was coming from the boot near the center of the truck where there are four bolts.

Any suggestions would be greatly appreciated.

Those trucks are notorious for bad hub bearings you might want to check that out