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-   -   Persistent rear "clunk" new fix (http://www.jeepgarage.org/f162/persistent-rear-clunk-new-fix-47059.html)

mjw930 09-05-2012 10:07 AM

Persistent rear "clunk" new fix
 
My SRT8, like many others, has the rear clunk at slow speed in Auto mode. I had the original software TSB applied, it didn't do much.

I had the truck in today to have the A/C looked at (not as efficient as my 2011 Overland) and happened to take a look at the current TSB's and noticed this one that was just issued TODAY:

http://www.wk2jeeps.com/tsb/tsb_wk2_1700112.pdf

To my surprise they have the part in stock, seems it's also a problem on the Durango's and I guess the engineers tried it on the SRT's and it fixed the noise issue. The part cross references to Chrysler, Dodge, Jeep and Sprinter!

I should get it back tonight, I'll let you all know if it really fixes it.

mjw930 09-05-2012 09:46 PM

Re: Persistent rear "clunk" new fix
 
New rear shock mounts are in and the noise seems to be gone so maybe there is hope that the slow speed clunk can be fixed.

mlarco52 09-05-2012 11:06 PM

Re: Persistent rear "clunk" new fix
 
What exactly is the slow speed clunk you are hearing? I hear a tad little clunk when I shift into gear from reverse to drive, but no noise what so ever driving at slow speeds of any kind. Just wondering what you are hearing.

Thanks

mjw930 09-06-2012 06:56 AM

Re: Persistent rear "clunk" new fix
 
1 Attachment(s)
Quote:

Originally Posted by mlarco52 (Post 679781)
What exactly is the slow speed clunk you are hearing? I hear a tad little clunk when I shift into gear from reverse to drive, but no noise what so ever driving at slow speeds of any kind. Just wondering what you are hearing.

Thanks

The clunk occurs on uneven pavement at slow speeds. It can happen when you go over a speed bump but is accentuated if you hit the speed bump at an angle so each wheel hits it at a different time. I have a number of roads I travel where the pavement is bumpy and I hit them at an angle when turning. The worst is entering my driveway which has what we call a Miami curb.

Attachment 16115

Since I enter at a 45 degree angle it rocks the truck back and forth as you drive in. The sound is like something is loose, like the spare tire, and it's hitting the chassis. Imagine if the rear hatch was loose and it banged the hatch frame when you hit a bump, that's the sound.

There are now 2 fixes for the noise. The first TSB updated the shock valving to increase rebound damping, that helped a little. The second is to replace the rear top shock mounts with a new design that I assume isolates the shock better. From what I've read the shock is actually reaching the end of its rebound travel and causing a clunk. It's actually topping out, not bottoming out. The new shock mount isolates the shock so the noise isn't transferred to the chassis. Apparently they had the same issue with certain Durango's according to the service manager at my dealer.

GreggSRT8 09-06-2012 10:35 AM

Re: Persistent rear "clunk" new fix
 
Thanks....I had the original service done to flash the TCB...it seemed to just decrease the clunk but not completely get rid of it.

Hope this new fix works.

HYTEK 09-06-2012 10:41 AM

I have this annoyance as well on my 12 Limited with tow package. I have an appointment for the trans clunk into neutral TSB to be done and I'll see if I can get this done at the same time too. Thanks for sharing this info!

mlarco52 09-06-2012 12:11 PM

Re: Persistent rear "clunk" new fix
 
I will go test it out again today see if its there but I haven't noticed anything after I had the first TSB reflash done. Maybe it's not for every srt and just some that are affected by it?

mjw930 09-06-2012 02:12 PM

Re: Persistent rear "clunk" new fix
 
Quote:

Originally Posted by mlarco52 (Post 680027)
I will go test it out again today see if its there but I haven't noticed anything after I had the first TSB reflash done. Maybe it's not for every srt and just some that are affected by it?

The part has superseded the old part number so I would assume it was changed in production at some point so you may already have the new part.

I drove it around town today making certain to use roads that really made it bang before and knock on wood, the "clunk" seems to be gone :D

mlarco52 09-06-2012 06:32 PM

Re: Persistent rear "clunk" new fix
 
What was your clunking sound like if you can describe it in words? I went over a bunch of speed bumps and in and out of my drive out today (neighbors probably thought I was on some sort of drugs) and didn't notice anything.

jeepster23 09-06-2012 07:39 PM

Re: Persistent rear "clunk" new fix
 
Quote:

Originally Posted by HYTEK (Post 679984)
I have this annoyance as well on my 12 Limited with tow package. I have an appointment for the trans clunk into neutral TSB to be done and I'll see if I can get this done at the same time too. Thanks for sharing this info!

If you read the TSB it states it only apllies to the SRTs just to let you know.

HYTEK 09-06-2012 08:16 PM

Quote:

Originally Posted by jeepster23 (Post 680253)
If you read the TSB it states it only apllies to the SRTs just to let you know.

Yes I've read the TSB and there's a few non-srt owners with the same problem.

HYTEK 09-07-2012 08:29 AM

I referenced the part # in the TSB to this link http://www.factorychryslerparts.com/...8029590AE.html and it appears that same mount is used on all Cherokee models and more. So the same clunk/rattle you SRT guys are experiencing, we are too. If the dealership refuses to fix mine due to the TSB being SRT specific, then I'll do it myself. I'm tired of my $43k truck sounding like my 99 XJ.


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