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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > Got the dreaded "Rear Rattle"

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Unread 04-05-2012, 08:39 AM   #1
Shinner
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1992 YJ Wrangler 
 
Join Date: Jul 2003
Location: Central PA.
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Got the dreaded "Rear Rattle"

Have known about this for just about a year. Last year at inspection time, the WJ needed rear shocks. Shortly after the rattle from the rear showed it's ugly head. It's the wife's DD so I told her take it back to the inspection garage and tell them to look into it. I rarely drive it so, didn't much care. She never took it back.

Fast forward a year and I'm now driving it for work to let her use my Camry getting to her school about 60 mi away (saves on gas).

So, of course the rattle bugs the living hell out of me. Researched it here and it seemed like a fairly common problem....having to do with bolts used and new shocks.

Changed the oil the other day and figured I'd pull a rear wheel to check it out. Bottom bolts look good and tight with the bracket pulled up on each side of the shock knuckle. Top, however, I'm not sure. It looks like the bushing is taking up the slack. Have a look at the pics.

Pulled the top bolt:


Top shock knuckle:




Shock installed (I did get the torque wrench out and tighten em down to 85 ft lbs, which is 5 ft lbs over spec):




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Unread 04-05-2012, 09:43 AM   #2
whosyadadie02
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Try sandwiching washers on both sides to preload them... from what I herd it's a common problem
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Unread 04-05-2012, 10:11 AM   #3
Double E
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Mine looked much like that after a shock change. I think if they were really the culprit of the rattle, they'd look a LOT more worn.

Just based on the natural axle travel and shock mouting angle, the shock has to rotate slightly from a 2 o'clock to a 7 o'clock position as seen by the wear on yours.

If the bolt were loose enough to make a rattle as described, I think you'd see gouging on the bolt as well and perhaps some ovals forming on the sleeve.

I only suggest this because I have the same annoying knock over road imperfections and my bolts are tight. I tried the washers as well with no change.
I'm thinking upper ball joint.
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Unread 04-05-2012, 01:34 PM   #4
billzcat1
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Could also be rear sway bar end links. Try removing the links and zip-tying the bar up so it doesn't flop around. Go for a drive.
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Unread 04-05-2012, 03:48 PM   #5
Shinner
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Quote:
Originally Posted by whosyadadie02 View Post
Try sandwiching washers on both sides to preload them... from what I herd it's a common problem
K...

Quote:
Originally Posted by Double E View Post
Mine looked much like that after a shock change. I think if they were really the culprit of the rattle, they'd look a LOT more worn.
And they're only a year old...would be hard to believe that they'd be trash so quickly.

Quote:
Originally Posted by Double E View Post
If the bolt were loose enough to make a rattle as described, I think you'd see gouging on the bolt as well and perhaps some ovals forming on the sleeve.
the bolts weren't loose at all and I couldn't physical move the shock from side to side.

Quote:
Originally Posted by Double E View Post
I only suggest this because I have the same annoying knock over road imperfections and my bolts are tight. I tried the washers as well with no change.
I'm thinking upper ball joint.
Sheesh, I hope not...just put a grand into it last yr to get through inspection.

Quote:
Originally Posted by billzcat1 View Post
Could also be rear sway bar end links. Try removing the links and zip-tying the bar up so it doesn't flop around. Go for a drive.
Good idea....will give that a try as well. The ones on the WJ are the originals. They seemed tight as well but I'll give it a shot.

Thanks guys....
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Unread 04-05-2012, 06:22 PM   #6
whosyadadie02
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Kk
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Unread 04-05-2012, 08:54 PM   #7
jerrod710
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Rear upper ball joints
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Unread 04-05-2012, 09:43 PM   #8
narnwv
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Quote:
Originally Posted by jerrod710 View Post
Rear upper ball joints
x2, but for clarity, there's only 1
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Unread 04-05-2012, 09:50 PM   #9
206wj
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my rattle was from the spring seated in the lower isolator a bit oddly and hitting... Replaced it and no more sound!
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Unread 04-14-2012, 02:17 PM   #10
Shinner
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Well, I finally got around to trying some things today. Disconnected the rear sway bar which left it and the end links hang free. No difference. Rattle still there.

Don't have much more time to look into it this weekend...have to drive to NC tomorrow.
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Unread 04-14-2012, 04:09 PM   #11
13bullets
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Quote:
Originally Posted by Shinner View Post
Don't have much more time to look into it this weekend...GET to drive to NC tomorrow.
Fixed it for ya.
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Unread 04-14-2012, 04:59 PM   #12
85IrocZ-28
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My wife told me last night that she heard a rattle coming from the rear when she was driving home. I grabbed the roof bars and tossed it side to side. All four of the rear endlinks sides need to be rebuild. I have the bushings, I just need to rebuild them. But we couldn't get it to make the loudest noise until I stood on the hitch and jumped. Sure enough, it is the top drivers side shock mount. It looks like I will be searching for some stiffer bushings, or else trying the washer sandwich method that everyone uses.
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Unread 04-20-2012, 11:05 PM   #13
Shinner
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Quote:
Originally Posted by 13bullets View Post
Fixed it for ya.
I actually like going down to NC...but the work really sucked. A lot of manuel labor. Shoulda sent a couple new guys (or a monkey). I make too much money to be wasted doing that crap. Was sold a bill of goods that it was going to be good training on a piece of equipment I've had a class on but am not "certified" on. That takes experience installing and working on the machine. Neither of which I'd gotten this week. About all I got out of the week was some OT. Nothing wrong with that, but it didn't move me towards being certified like it should have.

Quote:
Originally Posted by 85IrocZ-28 View Post
My wife told me last night that she heard a rattle coming from the rear when she was driving home. I grabbed the roof bars and tossed it side to side. All four of the rear endlinks sides need to be rebuild. I have the bushings, I just need to rebuild them. But we couldn't get it to make the loudest noise until I stood on the hitch and jumped. Sure enough, it is the top drivers side shock mount. It looks like I will be searching for some stiffer bushings, or else trying the washer sandwich method that everyone uses.
When I crawled under mine, I noticed that I added the washers when I installed the addco swaybar.
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Unread 04-21-2012, 06:54 AM   #14
robby65
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My rattle was the bottom drivers side rear shock moving.
I took bolt out and rotated the shock 180* and no more rattle.
Laid under the rear of the jeep and pushed up and down and saw the bottom moving.

They're monroe shocks in the rear
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Unread 04-22-2013, 11:53 AM   #15
dcorn
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For anyone in the future, just found this... My rear passenger shock has been rattling like crazy. Monroe shocks did it and my brand new Bilstein HD's are worse.

http://www.jeepsunlimited.com/forums...ad.php?t=36828
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