It sounded like thin metal rubbing something so I replaced my brake pads (the metal on the outer pad was hanging down. I thought it went away but there is still a sound. I put the truck in 4wd and it the noise became much louder. I think a bearing is worn or something.
What else could it be?
Can I take the front end apart, disconnect the driveshaft and still drive safely?
What do you guys recommend.

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-Recently purchased 02blue jeep liberty limited 4x4 w/ 112,000miles
-01Silverado HD Durmax/Allison Twin Turbo

Its relatively easy to remove your front driveshaft and see if it may be causing the sound. Just make sure you mark how the shaft lined up with the companion flanges before you remove the bolts with 8mm heads. After you remove it take the Liberty on a short drive.

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2002 Silver Sport 4x4 3.7L-5 Speed NV3550 Manual Transmission-NV231J TC-Frankenlift-AllJ Interior Rack-ARB Bumper-Hella Driving Lights-Electric Trailer Brake-Moog LBJs-JBA 4.5 UCAs-Detroit Trutrac (Front)-245/70/16 Dueler A/T Tires-Amsoil EaA201 Air Filter-Tom Woods Custom Front Drive Shaft-Rock Lizard Gecko HD Roof Rails-Onboard Co2