So i have a pretty stock 02 z71 silverado with about 32k miles on it... went offroading in the mountains a couple of weeks ago and noticed when i was gettin back on the highway to go home a funny lil rotational noise comin from what sounded like the drivers front wheel... just figured it was a rock stuck in the tread cause once i got up to 60 or so i couldnt hear it... but the noise has stuck with me and then the other day i had to put it in 4wd again when i was coming down from the ski slopes and the rotational noise (which only existed from 30-50 mph) turned into a more constant whine when 4wd is engaged.. which immediately concerned me. anyone have any ideas as to what i could check? before i put it back into 4wd i thought maybe i had messed up a wheel bearing when i was offroading.. but now i dont know whats wrong.. i experimented and the whine is there wether i put it in auto 4wd or 4hi... does that mean i should check the axle or the transfer case? cv joints? what do i look for? any help or suggestions would be greatly appreciated..

Walker

 

Check Fluids,i Am Will To Bet It Has A Bad Bearing I Seen That Alot

 

If the noise changes pitch while cruising and turning the steering wheel from right to left, left to right, etc., then it's more than likely a bad wheel bearing. (try this in 2wd)

 

see thats the thing it doesnt really change pitch... i can just hear the velocity change... the only time the noise changes pitch is if i engage the 4wd... when the sound becomes constant and higher pitched.. i guess ill just have to jack it up and play around with the wheel and cv shafts tomorrow...