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Re: troubleshoot cause of noise
Its not a CV joint if your getting the noise in neutral.It would have to have something to do with the motor if your hearing it both in neutral & decelerating.Do you by some chance have an oil leak? Possiblly onto a clutch or timing belt?
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Much of the symptoms you describe sound like a CV joint. I would take it to the dealer and insist that it be fixed... What is bothering me though is under normal operating conditions, CV joints and boots are engineered to last upwards of 150,000 miles. Some go the distance, but a lot reach the end of the road far short of their design life. According to one major aftermarket supplier of replacement axle shafts, CV joint shafts are typically being replaced at anywhere from 70,000 miles to 130,000 miles.
Read this and see if you agree... SYMPTOMS OF CV JOINT FAILURE Bad boots are not the only thing you need to look for. You also need to listen for noise or complaints that might indicate a CV joint problem. These include:
Popping or clicking noises when turning. This almost always indicates a worn or damaged outer CV joint. To verify this condition, place the vehicle in reverse, crank the steering wheel to one side and drive the vehicle backwards in a circle (check the rearview mirror first!). If the noise gets louder, it confirms the diagnosis and the need for a new CV joint or replacement shaft assembly.
A "clunk" when accelerating, decelerating or when putting the transaxle into drive. The noise comes from excessive play in the inner joint on FWD applications, either inner or outer joints in a RWD independent suspension, or from the driveshaft CV joints or U-joint in a RWD or AWD powertrain. The same kind of noise can also be produced by excessive backlash in differential gears. To verify the condition, back the vehicle up, alternately accelerating and decelerating while in reverse. If the clunk or shudder is more pronounced, it confirms a bad inner joint.
A humming or growling noise. Sometimes due to inadequate lubrication in either the inner or outer CV joint, this symptom is more often due to worn or damaged wheel bearings, a bad intermediate shaft bearing on equal length halfshaft transaxles, or due to worn shaft bearings within the transaxle.
A shudder or vibration when accelerating. May be caused by play in the inboard or outboard joints, but the most likely cause is a worn inboard plunge joint. Similar vibrations can also be caused by a bad intermediate shaft bearing on transaxles with equal length halfshafts, or by bad motor mounts on FWD vehicles with transverse-mounted engines.
A vibration that increases with speed. This symptom is rarely caused by a failing CV joint. An out-of-balance tire or wheel, an out-of-round tire or wheel, or a bent rim are the more likely causes.
if you slide under the truck and try moving the cv with your hands and there is any looseness in joint or noise the joint is indeed worn out, the cv joint if bad should not stop the truck from shifting into 4 wheel drive it could be stuck in 4wd and this would cause cv joints to break, if u have access to lift get all tires in air and try2 vs 4 drive and see if tires turn if not lift front tires off ground tires should turn freelyin 2wd, as u turn tires listen to wheel bearing and shaft noises for grinding clunking indicating bad parts, simple tricks that may help u find problems for cheap good luck!!
We have the same problem at our shop. We haven't rebuilt the front differential yet. We tried 3 different shafts on 2 different Jeeps and the noise is on both just the same. By greasing the front driveshaft cv joint, we got he noise to quiet some, but it is still way to loud. With the driveshaft out, the noise is gone. We are about to buy a new shaft from the dealer for $600. There are some service bulletins about some noisy driveshafts.
CV joint has gotten debris and moisture inside. The CV boot is bad and not protecting the joint. Now its metal on metal grinding. This happens when turning as there is more pressure on the joint. Please fix this ASAP as it can be dangerous to drive on a bad CV joint. While I have seen people drive with a bad CV joint for over 4k miles, it is NOT recommended!