Bottoming out?

[Cfm56doc]

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.

[Rose City GC SRT8]

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.

[Jack_Toepfer]

Though, a stock truck rides like crap over expansion joints on the runflats, it shouldn't be clunking.

[34z28]

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...

[Cfm56doc]

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.

[nyhockeyref93]

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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[Cfm56doc]

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.

[Mongoose9400]

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.

[Rose City GC SRT8]

That's stock. It is those stiff run flat tires.

[Naldo]

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