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Re: intermidint cluncking noise from front
That sounds like what may be happening is the "Vacumm Motor" that locks and disconnects the front axle is binding and not engaging all the way. Or possibly the vacumm supply is not sufficient. Trace the vacumm hoses and look for oil contamination or other damage. You may want to hook up a vacumm guage and check the two hoses. One will have vacumm on 4WD engage and the other on 2WD. You should see the same amount both ways.
Make sure that the 4WD engage lite works too. That would be the electrical switch on the front axle. It should turn on a indicator lite on. (I believe all models are equipped with one with that system)
And before you're done you should inspect all the u-joints and drive axle Constant Velocity joints for wear or the presence of rust around the caps. If there is rust around the cap it is probably full of rust instead of grease (bad) It good to check those periodically but those shouldn't be creating you're noise intermittently.
Let me know how that works for you.
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If you are only hearing this clunking sound when you are turning then you need to have your cv axles replaced. Also known as half-axles. In a truck, these are known as the universal joints. You can take your vehicle to the local tire/front end clinic and they will tell you whether or not, it is worth the fix.
if you are driving on hard surface ( sealed roads) in 4wd then don't as if damages the drive train
what is happening is that there is a torque wind up from the front and rear wheels running at different distances and the cluck you hear is when at some point that torque is released and allows the selection to disengage or engage
4wd is for use in slipper conditions unless you have an AWD which will become 4WD when required by you after selection of the control
It is usually the CV joints in the drive shaft(s) that are worn, and make this noise.
I would look at your CV joint boots, are they dirty and full of grease on the outside. Does the inner wheel well have grease slung onto it ?
Replacing the drive shaft is a difficult repair. I would have a reliable auto repair center give an estimate.
Please let me know what you find.
it sounds like the front differential needs to be rebuilt, if the driveshaft moves up and down then the pinion bearing has failed. the most economical way to deal with this issue is to replace whole unit with a low mileage one from the auto recyclers..
hello, only a sugestion but I would have the suspension checked, try pushing that side of your car down firmly and let go straight away. If it bounces 2 to 3 times that is fine, if its slugish this could very well be the problem. I hope this is of some use.
The auto t-case pushbutton switches in the dash have track record of numerous failures. It could put a check 4whl drive message in the message center. It sounds like you have a truck withauto t-case. It is easy to swap the switches and see if the prob moves, or at a GM parts dept they are about 50-65 bucks. Tilt steering wheel down, vehicle on flat ground here, key on not running, move gear selector down out of way. Pull on dash bezel to release all spring clips, when loose, pull top back towards you, then lift up and away. Look for any clips left in dash, they should all be on bezel. Key off bezel is on left and comes out self explanitory. Change or swap, reinstall and retest.
I had the same thing happen. The automatic locking hubs are faulty, causing one or both hubs to try to engage or disengage onto the front driveshaft. This makes the clicking noise and loud clunking that you hear. You may notice your steering pulling to one side of the road,because one hub is locked in. Replace the automatic hubs with new ones, do not try to fix the old ones. I liked the
convience of automatic hubs but replaced mine with manual hubs, there just way more reliable.
Its probably the intermediate steering shaft. The shaft where it goes thru the firewall is known for clunking on these trucks. GM makes a lube kit to fix the noise. I don't have the part number handy, but the parts guy at the local dealer will know what you are looking for.