I've been having an annoying tick-tick sound that is speed dependent, clutch in or out, coming from somewhere underneath the front half of my truck. It's been doing this for about 2 weeks now and lately has been accompanied by a high speed humming or howl with perhaps a tinge of vibration.
Could this be my U-joints going out?
If so how do I check without pulling everything apart?
I pulled my front wheels off while doing an oil change this morning and a loose bolt (from one of my past projects!) came out of the recesses of one of the rims, but unfortunately this didn't cure the noise as much as I would have liked it to :-laf
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Also, what is turning in the front end with the transfer case in 2wd only? Are one or both of the axle shafts still turning? - I was thinking about pulling the front driveshaft to isolate some of the noise...
If it's the axle shaft U-joints, how do I change those? Do I have to pull the unit hub and brakes off first? (Yes I haven't looked in my shop manual yet... )
Anyhow that Dynatrac locking hub kit looks even more attractive if the price comes down...
Could this be my U-joints going out?
If so how do I check without pulling everything apart?
I pulled my front wheels off while doing an oil change this morning and a loose bolt (from one of my past projects!) came out of the recesses of one of the rims, but unfortunately this didn't cure the noise as much as I would have liked it to :-laf

Also, what is turning in the front end with the transfer case in 2wd only? Are one or both of the axle shafts still turning? - I was thinking about pulling the front driveshaft to isolate some of the noise...
If it's the axle shaft U-joints, how do I change those? Do I have to pull the unit hub and brakes off first? (Yes I haven't looked in my shop manual yet... )
Anyhow that Dynatrac locking hub kit looks even more attractive if the price comes down...