My truck developed a squeaking/chirping noise while in motion. The noise slowed down and totally stopped as the truck rolled to stop. I suspected that it was a wheel bearing, CV axle (front), axle bearing (rear), universal joint or something else. Given the high frequency of the noise, it seemed that it was most likely related to the drive shaft (front or rear on the 4 x 4). I took it to the mechanic and he quickly isolated the source of the noise. The noise source was the dust boot where the rear drive shaft joins to the transfer case. Apparently the boot was dry and chirping/squeaking due to the friction with the driveshaft. He applied some grease - problem fixed. Easy fix this time.
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