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WK1 Troubleshooting / Problems Discussion / Dealer Service If you are having some problems with your Jeep Grand Cherokee SRT8 and need assistance in troubleshooting and diagnosing the problem, this is the proper place to discuss it. Were you treated fairly or poorly at a dealer? Warranty issues? Let us know.

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Old 12-30-2012, 07:41 AM
Cfm56doc Cfm56doc is offline
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Bottoming out?

I bought my 07 used in sept with only 29k miles on it. As far as I can tell it was 100% bone stock. I am in the process of my first road trip in it and I have a question.

Sometimes when I hit the expansion joints on bridges, it sounds like the front suspensions bottoms out and a very loud bang is heard and felt through the cabin. I was thinking this may be the stiff sidewall of the run flats transmitting the bump through the suspension, but the more often it happens I am beginning to think the suspension is bottoming out.

How can I tell if it has the stock or aftermarket springs and anyone have any ideas?

Thanks in advance.


Btw it is definitely the front and not the exhaust in the rear.
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Old 12-30-2012, 09:31 AM
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Show a side pic of your rig and we can tell you if it has been lowered or not. This should not occur on a stock rig if everything is OK.
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Old 12-30-2012, 02:47 PM
Jack_Toepfer Jack_Toepfer is offline
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Though, a stock truck rides like crap over expansion joints on the runflats, it shouldn't be clunking.
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Old 12-30-2012, 08:46 PM
34z28 34z28 is offline
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could be front differential bushing.. I just replaced mine, what a pain...My symptoms were I heard strange noises usually a clunking but on occasion sounded link I bottomed out when a passenger was in the car or going over speed bumps or transitions in the pavement. It did not happen all of the time but was more noticeable with a passenger.

After careful inspection I found the rear differential bushing was torn.

I replaced with a factory part and it was a pain. Not impossible just hard to get too...
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Old 12-31-2012, 02:48 AM
Cfm56doc Cfm56doc is offline
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Thanks all for the reply. I got home late last night from my trip so I will try to get the photo up later today before I head down to Texas to help move a relative.

I am thinking it is just the run flats hard side wall and low profile transmitting the noise. 99% of the time it rides perfectly with no noises, it is just those damn joints where the bridges meet the road. It sounds like I nail a major pot hole when it happens. I worry about jacking up a rim.
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Old 12-31-2012, 04:34 AM
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Your best bet will be is to get rid of the run flats, they will shred very soon and very dangerous. Plus when you put on any other tire it's like your almost driving a Mercedes lol. I switched to toyo's and it was a night and day difference and a lot less cheaper than the run flats


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Old 01-02-2013, 04:38 PM
Cfm56doc Cfm56doc is offline
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Here is the side shot. Sorry it took so long. I am guessing this is stock height.





Since it rides fine nearly all the time I feel confident it is the tire but still worry about bending a rim.

Last edited by Cfm56doc; 01-02-2013 at 09:05 PM.
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Old 01-02-2013, 04:58 PM
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Mongoose9400 Mongoose9400 is offline
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Looks stock height to me.

I bottomed out my 07 a couple times on stock suspension when hitting poorly shaped transitions with around 40K miles on it. It is possible to do, but I only did it a couple of times.
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Old 01-03-2013, 07:52 AM
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That's stock. It is those stiff run flat tires.
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Old 01-03-2013, 08:01 AM
Naldo Naldo is offline
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I drive my vehicles like I stoled them most of the time, and I bottomed out some if you slow down it doesn't happen, just look ahead just like you do for cops and decide the appropriate speed for the road lol
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