Rear end knock

[Tog]

Got a knock in the rear sounds to be left side only notice it when going over rough road and initially sometimes on take off . I have checked shock mounts trailing arm bushes only other thing I can think of is the ball joint in the boomerang. Any suggestions.




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[ltd02]

I'd lean toward the boomerang. Especially if the LCAs look ok.

 

[HoosierJeeper]

Are the shocks leaking? Mine made a huge clunk when the shocks were bad.

Otherwise, probably UCA, not much else it can be back there.

 

[Tog]

Shocks are new so that's not likely. Boomerang is looking most likely it kinda feels a bit loose in the rear especially when on and off power.

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[tommudd]

Shocks are new so that's not likely. Boomerang is looking most likely it kinda feels a bit loose in the rear especially when on and off power.

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If when on and off power then thats LCAs

 

[Tog]

Ok will check them again the bushes felt solid as.

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[tommudd]

Ok will check them again the bushes felt solid as.

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Heres one way to check
With KJ on level ground in park e-brake off , take a 4 way on one lug nut. Now roll the KJ back and forth that way, you will be able to see the arm move if bushings are bad

 

[Tog]

So I have tested the LCA'S as you said Tom and found no movement I also removed them and there is no visible wear in the rubber. I can also find no signs of wear or free play in the u can ball joint. The bushes in the u can are relatively new poly done before I bought the vehicle as are the LCA'S non original they appear to be same design as moog r series

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[HoosierJeeper]

Shot in the dark here, but what if you switched the shocks around? I know you said they're new and they aren't likely the issue but stranger things have happened. Pretty easy to do, beats throwing more $$$$ at it until you know for sure.

 

[Tog]

Worth a try

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[GunnerSchenck]

I know you said knock, but would a bearing be out of the realm of question?

 

[Tog]

I have checked wheel bearings they feel ok. The noise is not typical of a bearing it's honestly like a loose shock mount. I have swapped shocks and will be driving soon to check that out




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[Tog]

So swapped the shocks definite improvement but there is still a a knock occasionally also hearing a rattle but I think it's in the front lower clevis bushes are a bit suspect

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[Whelan]

Could it be the springs? I replaced the shocks and springs on our '05 and now I get a random clunk/knock in the rear when going over certain bumps. It almost sounds like the spring is hitting metal on metal. I checked the rubber isolators but they look fine, springs installed the right way to. Could using the OEM isolators be the issue? wondering if putting in a new pair would help.

 

[Tog]

It could be springs the left side always sounds like it's slamming into the bumpstop when I pull into my driveway it's only a 2 inch step in the concrete so there is no way the springs should compress that far.

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[HoosierJeeper]

That sounds exactly like how it was when my last set of Bilsteins went bad, well one of them went bad but I ditched both for OMEs. It was the driver's rear. It felt like it was bottoming out and would send the bump right through my back.

 

[Tog]

Shocks have only done about 2000km so that shouldn't be an issue the only time I notice it is pulling into the driveway and there is no shock in the car just the noise.

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[HoosierJeeper]

What brand of shocks are they?

Guess it isn't a shock...if you can't feel it.

 

[Tog]

Shocks are Oztec only available in Australia

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[HoosierJeeper]

It's really interesting that it changed when you moved the shocks around.