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Old 07-09-2014, 03:31 PM   #1
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Rear bottoming out

I'm having an issue with my JKU bottoming out all the time on street driving anytime I hit a bump or pothole. I thought initially my shocks were done and put in a rear pair of Ranch9000s. That seemed to help but any bigger bump still causes that metal on metal clank in the back.
I'm guessing it must be the coils? They are still the stock ones from '08.
Any ideas on what else it might be? I seem to remember paper covers over the area I think is called the bump stop, but that is all worn away.
Here are the two rear sides if the pics help.
Thanks in advance for any tips.
-Pete


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Old 07-09-2014, 03:56 PM   #2
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I don't have any advice, yet, but I am interested to know if you have lift installed (size and brand) and what size and brand of tires.

There may be a correlation...

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Old 07-09-2014, 04:29 PM   #3
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No Lift

All stock. Just an '08 X with upgraded 17" tires from a 2011 Sahara take off and the Ranchos. No lift. Just kept getting worse over time and thought it was because I was maxing out the load in the car with 5 people and a full cargo load for a few weeks that I just wore out the shocks.
-Pete
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Old 07-09-2014, 04:49 PM   #4
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Wonder if just replacing the rear coils/springs might be the next best step. Any idea how tough a project that might be? Might post a stock coils wanted or look for good aftermarket recommendations.
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Old 07-09-2014, 05:02 PM   #5
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RX9000XL or 9000? Is the jeep loaded or empty when it's bottoming out? And I'd also get under there with a can of rust inhibitor and stop that rust before it gets worse!!
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Old 07-09-2014, 05:17 PM   #6
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RX9000XL or 9000? Is the jeep loaded or empty when it's bottoming out? And I'd also get under there with a can of rust inhibitor and stop that rust before it gets worse!!
Rx9000xl though the issue started with the old stock ones.
Will get up there with an inhibitor. Thanks for pointing that out.
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Old 07-09-2014, 05:19 PM   #7
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Rx9000xl though the issue started with the old stock ones.
Will get up there with an inhibitor. Thanks for pointing that out.
Oh and happens empty, but certainly much more obvious with family and groceries inboard.
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Old 07-09-2014, 05:22 PM   #8
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Oh and happens empty, but certainly much more obvious with family and groceries inboard.
The XL's are adjustable, what # do you have them set at??
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Old 07-09-2014, 05:30 PM   #9
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I have tried 0, 5, and 10 and all have the issue. Why I moved to thinking it is the coils or other issue.
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Old 07-09-2014, 05:44 PM   #10
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Okay, to me I see rust everywhere, but the coils look pretty clean. It also looks like stock coils, but there's a 2.5"+\- metal bump stop block and the bump stop itself looks to be completely destroyed. Did this jeep used to have a lift? I'd get rid of that extra block, replace the bump stops to start with.
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Old 07-09-2014, 05:46 PM   #11
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Now you did say no lift correct. It appears by the photo you have bumpstop extensions (the square steel tube bolted to the axle bump pad). That would certInly explain bottoming out.
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Old 07-09-2014, 06:08 PM   #12
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I bought it new and ran it the way I got it for 3 years. Upgraded the tires then and all was fine for 2 years. Had my in-laws with us for a month and ran all 5 of us over the NJ "mountains" during that time. Did have the water pump fail at that time but warranty fixed it. Then the banging slowly crept up getting worse and worse. New shocks and that helped overall suspension a lot, but the bigger bumps still smash down.
Did take it to neighborhood mechanic to take a look and he saw a bunch of things loose which he tightened and overall ride is better, but any bigger bump still crashes down in the back Though front is fine.
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Old 07-09-2014, 06:08 PM   #13
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How old are your new shocks? Because if they're new I've had those shocks before you can tell if they're working or not. Contact Rancho here to see if they can give you some trouble shooting tests.
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Old 07-09-2014, 07:03 PM   #14
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I agree with the comments about getting your bump stops right and stopping the rust but what you're describing, to me, sounds like worn out coils. Get some take offs and replace them. It's cheap and easy. I've had mine off four times in the last year. No special tools or skill required.

I'd also make sure your new shocks are sized correctly so you don't destroy them.
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Old 07-09-2014, 07:46 PM   #15
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Hold up ... It's not lifted right ? You have 2" stops there and it looks like 0 lift. Possible hitting the bumpstops ?
The jounce bumper looks destroyed
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Old 07-09-2014, 07:50 PM   #16
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Hold up ... It's not lifted right ? You have 2" stops there and it looks like 0 lift. Possible hitting the bumpstops ? The jounce bumper looks destroyed
You just beat me to it. Looking at it saw that too.
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Old 07-09-2014, 07:55 PM   #17
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Just getting back to this conversation. Looks like kjeeper and sinister already solved it.
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Old 07-09-2014, 07:56 PM   #18
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Quote:
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You just beat me to it. Looking at it saw that too.
Very common with older TJ's
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Old 07-09-2014, 08:46 PM   #19
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Just getting back to this conversation. Looks like kjeeper and sinister already solved it.
We already said bumpstop extensions back 6-7 posts ago.

The strange part is, For some reason the OPs stock Jeep that he bought new has bumpstop extensions. The reason it is slamming down now that the springs are worn out, is that the rubber bumps are destroyed and your getting steel on steel.
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Old 07-09-2014, 09:24 PM   #20
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Originally Posted by JTPhoto JK View Post
We already said bumpstop extensions back 6-7 posts ago. The strange part is, For some reason the OPs stock Jeep that he bought new has bumpstop extensions. The reason it is slamming down now that the springs are worn out, is that the rubber bumps are destroyed and your getting steel on steel.
Oh, cool. I didn't read all the posts, just the latest. Glad you guys figured it out.

I saw he had the bump stops and that's why I wondered what lift he had cause it didn't seem like much if at all.
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Old 07-09-2014, 09:30 PM   #21
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Check your lower control for any indication of wear. It might be light but I'd check it as I have what sounds like the exact same problem. I'm being led to believe that the trackbar just needs to be loosend and rotated back and upward. I have a 3.5" Rockrawler lift.

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Old 07-11-2014, 12:04 PM   #22
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Thanks guys. So not being the most mechanically savvy, here is my understanding. Jeep came with 2" bumpstops but 0" lift and was fine when coils and shocks were new. Now coils are compressed a bit and things are banging down and destroyed some related parts.
So best plan of attack is to look for stock take off coils which I should be able to put in myself (I did do the shocks) and then maybe see about replacing the rubber part of the bump stops?
Cheers!
-Pete
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Old 07-11-2014, 12:20 PM   #23
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Thanks guys. So not being the most mechanically savvy, here is my understanding. Jeep came with 2" bumpstops but 0" lift and was fine when coils and shocks were new. Now coils are compressed a bit and things are banging down and destroyed some related parts.
So best plan of attack is to look for stock take off coils which I should be able to put in myself (I did do the shocks) and then maybe see about replacing the rubber part of the bump stops?
Cheers!
-Pete
The first thing you should do is remove the bump stop extensions. They should be bolted on. Then replace the bump stop pad. Then if the issue is resolved you won't need new springs.
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Old 07-11-2014, 01:26 PM   #24
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Good idea. Working on getting those things off now. They are the "squares" bolted on top of the axel correct? Then the bump stops mount above? Think I can run to the auto store for a pair of those.
Or rather, they are inside the coils at the top yes? (after googling images)
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Old 07-11-2014, 01:38 PM   #25
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Good idea. Working on getting those things off now. They are the "squares" bolted on top of the axel correct? Then the bump stops mount above? Think I can run to the auto store for a pair of those.
Or rather, they are inside the coils at the top yes? (after googling images)
Yes to the first question.

Second question, the bump stop absorber is directly above the axle pad that you are removing the extension from. This piece is made of a foam type of material and is a dealer only part as far as I know.
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Old 07-11-2014, 01:41 PM   #26
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The yellow bumper is called a jounce bumper.
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Old 07-11-2014, 01:46 PM   #27
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I'm learning bit by bit. So not having any luck loosening the bolts on the extensions, mostly just hard to get two wrenches on. Bottom head won't let you use the circle side of the wrench as its too close to axel. And absorber that goes above is likely dealer only and not the nub called a bump stop I saw on Quadretec. Looks like those absorbers snap in and you need to push both tabs in with a screw driver to remove.
Letting the bolts soak in WD-40 for now.
Thanks so much Zak and everyone!
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Old 07-11-2014, 01:48 PM   #28
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So the nub is a jounce bumper and there do seem to be both dealer and third party options. But likely for me whatever they mount to is cooked. Can address that after I get these extensions off.
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Old 07-11-2014, 02:08 PM   #29
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The bumper is just a absorber like a shock. Def try and get the extension of the axle. The bumper can wait.
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Old 07-11-2014, 03:07 PM   #30
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I cheated. After an hour of fighting with the bolts, I ran it down to the shop that just worked on my Volvo and had them throw it up on a lift. Even ended up just cutting the bolts anyway. But happy to say zipped up my hill on the way home over some nice big bumps and no issues.
You guys rock. All said and done, $20 rather than making a trip to the dealer who likely would have replaced the coils and sent me home a few hundred dollars poorer.

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