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Old 11-13-2011, 06:04 PM
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01 Jeep Noise in DriveLine??

I have a 01 Jeep GC limited with quadra drive and there is an annoying howl as I drive down the road. I notice it more upon letting off accelerator, but it is definitely there while cruising or accelerating. At first it sounded like wheel bearings so we replaced both fronts and still noise. It also sounds like it is coming from the front end of the vehicle. The CVs do not bind or make any weird noise when turning etc so I am not sure if this is a CV axle, a differential, a front drive shaft or a what?
Also the CV boots look great. Any other ideas?
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Old 11-13-2011, 08:37 PM
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Re: 01 Jeep Noise in DriveLine??

Could also come from diff or even T-case. Did you check the fluid levels and are the fluids not due for a change?
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Old 11-14-2011, 03:55 PM
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Re: 01 Jeep Noise in DriveLine??

Well today I changed the fluid in the front differential which was definitely due for a change. So I'm going to do the rear, transfer case and tranny this week. I also replaced the passenger CV axle and the noise is still there, but it seems to now be isolated to drivers side so I guess I'll see whats up when I do that CV this week. Definitely drives ALOT better.
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Old 11-17-2011, 08:13 PM
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Re: 01 Jeep Noise in DriveLine??

Were you able to eliminate the problem?
I also have the same sort of problem and changed the oils as well as having the front diff overhauled.
Mine sounds more like a gear winding down noise when you stop and start
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Old 11-19-2011, 02:56 AM
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Re: 01 Jeep Noise in DriveLine??

Ypahihi, your noise sounds like gear tooth contact issues. Further inspection would be required as to where its coming from and why, typically alot of gear tooth contact noises will run forever.

Most howling is the indication of a failing bearing, your just going to need to isolate where the noise is coming from, front rear, left right center... Differential bearing wear is very common on the WJ. Kinda late now but whenever I do a diff service I pop the cover drop it down and catch a good couple cups of the fluid then pull it out for examination... if its full of glitter (metal) if its not the one making noise it will be soon.
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Old 11-19-2011, 09:15 AM
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Re: 01 Jeep Noise in DriveLine??

The only issue I have is that I haven't been able to identify where it's coming from.
Is there a logical routine to follow that will help eliminate where it is coming from?
Some days it sound like it's coming from the drivers side, same days the passengers side and then other days it sounds like the rear diff.

I've had 3 mechanics and the transmission / diff guys drive the car and they all seem to point at various areas.
Being in Darwin where Jeeps (especially WJ, WG's and WH's) are such a rarity and about 90% of all work is done at the stealership ($812 for a clutch fan incl postage) has limitations on mechanics that are familiar with Jeep quirks and cash in my wallet.
Sorry, I'm ranting again.....

As soon as I eliminate the coolant issues my next job is the noise. If there is a link you can point me towards it would be greatly appreciated......
-Barney
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Old 11-19-2011, 01:44 PM
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Re: 01 Jeep Noise in DriveLine??

For driveline noises I always like to have the vehicle in the air and use a stethoscope to isolate the main area of the noise while having an assistant run the vehicle up to speed (REDICULOUSLY DANGEROUS ON THE GROUND) you still have to be very careful in the air I wouldnt be caught dead under a rig on jackstands running up to speed (litterally I wouldnt be caught dead because I wouldnt be under there ), obviously its all metal and there will be vibration transferance but you can narrow it down front or rear and side to side.
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Old 11-19-2011, 05:42 PM
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Re: 01 Jeep Noise in DriveLine??

This is achievable and the mechanical/medical backup will be in the same room (in case something does go wrong)
Thanks for the info. I will give it a go and update in the near future
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Old 01-29-2012, 08:40 PM
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Re: 01 Jeep Noise in DriveLine??

I have a 2004 with Quadradrive. In cold weather, below 38F, for the first 5 miles of driving, I get a terrible screaching from the front drive line. I've had mechanics and most recently drive line specialists work on it. They have been able to duplicate but can't find the reason. All believe it is the left front. I replaced the hub bearings without change. Never happens in warmer temperatures and when the vehicle is warm. Definately drive line related, not brakes, not steering or power steering pump or belts. This has been going on for over a year and does not get worse like you think it would if the CV joint was failing. Sounds similar to noised mentioned in this forum. Any more ideas?
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Old 01-30-2012, 10:18 AM
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Re: 01 Jeep Noise in DriveLine??

In another thread in regards to noise or vibration issues, I mentioned the use of a dyno machine where the car or Jeep can be strapped down on rollers that help simulate driving under a strain. That can help find or isolate a problem. Also there are vibration monators that can be attached to suspected areas while you drive around.

Your problem will be doing testing with the temperature under 38 deg there is Las Vagas!
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Old 02-05-2012, 07:55 AM
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Re: 01 Jeep Noise in DriveLine??

I have a 01 Grand Cherokee LTD 4.7v8. Jeep had 150,000 miles when I purchased. It had a binding problem and the noise that is being refered to. Replaced all fluids with the OEM fluid and added the additive to both diff's and transfer case, even though they say the transfer case does not require it. After driving the jeep for approx. 500 miles or so the binding is gone, the noise (gear like whine) is still there allthough (may be in my head) it seems to have made a difference for the better. I highly recommend the additive be put in the transfer case when servicing, the dealer says it is not required but will not hurt anything, so why not? This WJ is a 1owner (I am the 2nd) and has the quadra drive system. Hope this helps.
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Old 02-05-2012, 11:58 AM
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Re: 01 Jeep Noise in DriveLine??

Hi 43GUY, did you put limited slip additive in the T-case? It will probably make the progressive coupling to slip a little, not sure if that is such a good idea, because it could burn the coupling plates. In the diff the additive is needed to be able to make turns without wheel slip, but if you for example use 2 different tire sizes on 1 axle (which would cause a permanent speed difference between those 2 wheels, so permanent slip in the coupling), the coupling will give problems sooner or later. We saw it already with one of the members here, who used a (smaller) spare tire for a week or so, and who damaged the Vari-Loc in the diff.
Ofcourse you would not expect constant speed differences between the front and rear propeller shafts, so for the T-case the problem is probably less, but still......
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