A couple days back, my front end/differential locked up while leaving my house. It goes in and out of 4wd ok but still grinds and bucks at certain times. the 4wd Lo works without any noise or vibration at all. I was wondering if this would be the actuator or the front differential itself.
Drain the oil from the front diff and check for metal flakes
If you have flakes --diff problems
if the oil is clean then look else where --like cv joints or "U" joints in drive shafts
SOURCE: 99 silverado 4wd went out... transfer case?
a little tip a friend gave me in unlocking the 4wd drive on ramps or hill and then put in neutral let roll back a foot put in park and then let off the 4wd
when in 4wd the hubs get a little heated cause they need greased so they stick into position making it hard to come out of 4wd this which i spoke of i got stuck in the senerio where i almost drove home in 4wd from 300 miles away but i called my friend he told me bought this and so i thought it could help you
your hubs just locked up on you your bearings are going to need to be packed again this is normal for this
hub
SOURCE: 99 Silverado 4-wheel drive not engaging
It does not seem that sufficient diagnosis was done. No, you cant give a specific diagnosis like that without tearing unit down. It's likely that they told you the most common failure and left it at that. Likely there is a problem with your unit...I think this becomes more of a trust issue than a mechanical one. A second opinion from an independent reputable shop may help but either way, you need to have it fixed. In not using it much, it makes me wonder how it got worn.
good luck
SOURCE: grinding noise front end
its either your front brake pads or your CV joint is going bad .. Jerry
SOURCE: Rumbling & grinding under front end
Watch out! You might have a loose wheel! Check those wheel nuts. If not, a loose brake caliper, or last if not least, a bad wheel bearing. Don't drive it until you find out what the heck is wrong! Could be dangerous.
SOURCE: grinding in front end
If the sound changes as you turn side to side it is your wheel bearing (hub assy)
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Hi. From your symptoms take a look at the front axle actuator. Please check fuses first and then unplug the actuator. Raise one wheel from the ground and see if that wheel spins free. If not replace the actuator. If the wheel spins free then further testing will be needed. You can inspect the axle actuator solenoid and the transfer case relay. Good luck.
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