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  #145  
Old 03-10-2013, 07:52 AM
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Re: Wk2 Rear Knocking Noise Aussie GC Laredo

Well my car did not come with these so I have no warrantt to fall back on so I have to come up with a solution to this problem since I now have it as well. I agree that Chrysler should be coming up with a solution for you all, but if they are not smart enough to see that both shock mounts are designed differently and that it is a shock mount issue that is transmitting the noise. The dealership can only recognize that the problem exists and keep replacing the part.

The bushing will not touch the body.... remember I am going to be using the metal plate that is part of the normal duty suspension shock mount.

The plan is to use the bushing and plate to restrict movement of the shaft in the mount.

I will try to post a picture of both shock mounts later today
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  #146  
Old 03-10-2013, 08:03 AM
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Quote:
Originally Posted by Jeep_addicted View Post
The bushing will not touch the body.... remember I am going to be using the metal plate that is part of the normal duty suspension shock mount.

The plan is to use the bushing and plate to restrict movement of the shaft in the mount.

I will try to post a picture of both shock mounts later today
Ok, got that and your logic makes fully sense. My point was that you create a new contact with baseplate then (which contacts the well, although damped with the rubber piece). The current mounting might have some 'constructional' flexibility built in to damp the transfer of noise. Especially, since there is no other damping originally.
In any way it is a sensible improvement and putting a bushing or taking it out is then just simple.

Just checked the TSBs out for this rattling on the normal suspension;
http://www.wk2jeeps.com/tsb/tsb_wk2_1700210a.pdf
http://www.wk2jeeps.com/tsb/tsb_wk2_1700111.pdf
http://www.wk2jeeps.com/tsb/tsb_wk2_1700213.pdf

They changed the mount and even recommend with the SRTs to keep the old baseplate. Unfortunately the pictures aren't that good, you can't see the rubber pieces. The new shock mount is 68029590AD.
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  #147  
Old 03-10-2013, 08:53 AM
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Re: Wk2 Rear Knocking Noise Aussie GC Laredo

My Shocks have been replace 5 times, each time with a new part number that has superseded the last one install. Still have the problem.
I have submitted a complaint with the BBB and the Lemon Law office as well as with Jeep office direct. I am not going to give them any more trial and error. Either they fix it or they buy it back.
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  #148  
Old 03-10-2013, 06:01 PM
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Re: Wk2 Rear Knocking Noise Aussie GC Laredo

Very interested in your solution Jeep addicted as I was looking at something similar as the rattle has to go, keep us posted
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  #149  
Old 03-10-2013, 10:58 PM
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Re: Wk2 Rear Knocking Noise Aussie GC Laredo

Here are the pictures I promised!


Take a look and tell me if you all come up with any ideas to dampen the SLS shock noise....

Here is the profile of the SLS shock



Here is the profile of the normal duty shock ( note the metal plate on top)



Here is the top view of the SLS shock



Here is the top view of the Normal duty shock without the metal plate ( note all the rubber lining that dampens the transmitted noise)



Here is the normal duty shock with the plate installed

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  #150  
Old 03-11-2013, 06:23 AM
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Re: Wk2 Rear Knocking Noise Aussie GC Laredo

Maybe you fill in the void with a good quality silicon.
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  #151  
Old 03-11-2013, 10:23 AM
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Re: Wk2 Rear Knocking Noise Aussie GC Laredo

What ever you use it better have some sound absortion properties.

The basic principle here is the deaden the frequencies transmitted to the wheel well metal.

All metal transmit some sort of freqeuency take a wrench and bang a peice of pipe it will ring at a certain frequency.

Now take the peice of pipe and fill it with fluid paper or some thing else and it alters the frequency resonance of the pipe.

If the shocks are generating noise as they function then we have to snub the noise some how.

If the shock mounts are the issue we can limit the upward travel of the shaft in the mount by applying some compliant tension with the addition of a bushing and the plate. Hopefully the bushing will cut down on the resonance.


The fact that the ND shock mount had a dampner in it tell me something right there.

I am waiting for the Poly urethane bushings I ordered to arrive to test my theory.


If you own a V6 take a look at the exhaust system you will see a large peice a brown rubber attached to the pipe it is some sort of frequency dampner.
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  #152  
Old 03-11-2013, 05:05 PM
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Re: Wk2 Rear Knocking Noise Aussie GC Laredo

Jeep addict
Do you think it's possible to use the standard shock mount with the SLS Shocks.To solve my noise issue I'm looking at buying the standard shock mount and fitting Dobinson shocks and springs.
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  #153  
Old 03-11-2013, 08:38 PM
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Re: Wk2 Rear Knocking Noise Aussie GC Laredo

Quote:
Originally Posted by Baxter View Post
Jeep addict
Do you think it's possible to use the standard shock mount with the SLS Shocks.To solve my noise issue I'm looking at buying the standard shock mount and fitting Dobinson shocks and springs.
I am not sure because the SLS uses a spacer on the shaft and the ND shock mount is shallower than the SLS mount
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  #154  
Old 03-11-2013, 09:52 PM
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If I recall my SLS correct, than there is a rubber bushing right under the silver washer. It's hard to tell what the rubber is for on the ND shocks; shall it prevent touching the metal housing or is it the bushing of the shock lever? Maybe a picture from a side angle rather than from the top would help a little.

My initial understand from your post was, that there is rubber between the shock mount and the base plate. That would from my understanding dampen the noise, but the pictures show that the ND shock mount has metal to metal contact with the base plate. So there is no dampening at all.
Only difference then could be the shock lever mount, and that is again if I recall that correct at the SLS mounted with a rubber piece too. So what is really the difference in the actual mount to the shock mount? The ND just looks like covered with rubber.

I have my doubts with the analogy of the pipe. It's less a free swinging metal piece but transferring hard pushes through, maybe some noises within the shock or some looseness in the all the bits and pieces of the shock. Therefore putting some damping between the shock and the wheel well would help as your idea with the poly bushing to reduce the moving or looseness. My theory is that as long as the shock mount bolts directly to the wheel well you will hear some noise.

What you think if some strong rubber would be fit between the shock mount and the baseplate (I think of an rubber mat electricians use to isolate them, so called 1000 Volt mat). Would that damp and more important still be secure?
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  #155  
Old 03-13-2013, 09:45 AM
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Re: Wk2 Rear Knocking Noise Aussie GC Laredo

Quote:
Originally Posted by Suther View Post
If I recall my SLS correct, than there is a rubber bushing right under the silver washer. It's hard to tell what the rubber is for on the ND shocks; shall it prevent touching the metal housing or is it the bushing of the shock lever? Maybe a picture from a side angle rather than from the top would help a little.

My initial understand from your post was, that there is rubber between the shock mount and the base plate. That would from my understanding dampen the noise, but the pictures show that the ND shock mount has metal to metal contact with the base plate. So there is no dampening at all.
Only difference then could be the shock lever mount, and that is again if I recall that correct at the SLS mounted with a rubber piece too. So what is really the difference in the actual mount to the shock mount? The ND just looks like covered with rubber.

I have my doubts with the analogy of the pipe. It's less a free swinging metal piece but transferring hard pushes through, maybe some noises within the shock or some looseness in the all the bits and pieces of the shock. Therefore putting some damping between the shock and the wheel well would help as your idea with the poly bushing to reduce the moving or looseness. My theory is that as long as the shock mount bolts directly to the wheel well you will hear some noise.

What you think if some strong rubber would be fit between the shock mount and the baseplate (I think of an rubber mat electricians use to isolate them, so called 1000 Volt mat). Would that damp and more important still be secure?
It is just a theory but basically what is was getting at is if I hit the SLS mount with a wrench I get a nice ping.

If I hit the ND mount with the same wrench I get a dull thud. so the rubber in the ND shock mount is damping the some of the resonance.
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  #156  
Old 03-13-2013, 10:44 AM
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Re: Wk2 Rear Knocking Noise Aussie GC Laredo

I have a 2011 JGCO w/QL. I just hit 26k miles and it started making the noises you are describing. The video posted earlier in this thread replicates the sound exactly:

I had it into the dealer yesterday and they are ordering me ONE new rear shock. My question to you is should I demand two shocks? Also... Should I be asking for a specific part number?

Lastly... Have any of you been able to recreate the noise with the vehicle parked and on jack stands/lift? If so can you post a video of the specific area causing the noise?
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