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2005 GXP Rear Thumping

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paulhunde

New member
Sorry if this has been covered already, but didn't really see what I was looking for in previous posts. My 05 GXP has terrible thumping noise in rear, so I assumed it was the struts and/or mounts. I have Bilsteins. When I took it apart it looked as though the mount was fine, but can't really tell whether the strut is shot. I'm just wondering if maybe the top nut came loose on each side?
 


Strut mounts? Pop off any covers over the rear strut mounts in the trunk and bounce the rear susppension and look for cracks in the rubber strut mounts.

Also check the rear sway bar bushings. When worn they with make the car make noise over bumps.
 


buickman104 said:
Strut mounts? Pop off any covers over the rear strut mounts in the trunk and bounce the rear susppension and look for cracks in the rubber strut mounts.

Also check the rear sway bar bushings. When worn they with make the car make noise over bumps.
Click to expand...

The strut mounts looks good, looks like there's a little play between dust cover and strut mount. Haven't checked the bushings yet.
 
How does the tread wear look on the rear tires? Any signs of cupping? If so, then the struts are shot and letting the tires bounce/skip over bumps, creating the uneven wear patterns in the tread.
 
Check the little trailing arm that sets rear toe. Mine made noise for a while and finally got under there and the nut on one side was loose and causes it to clunk when going over bumps.
 
How many miles on struts?

Tear the rubber off the strut mount in the trunk and check the nut. Chances are they are fine and you have to go strut shopping.

That is the exact noise I had on rear FE3s with 20,000 on them
 
spazzz said:
How many miles on struts?

Tear the rubber off the strut mount in the trunk and check the nut. Chances are they are fine and you have to go strut shopping.

That is the exact noise I had on rear FE3s with 20,000 on them
Click to expand...

Car has 85,000 on it. Only had it a year and a half, so not sure when they were last changed. Did the Bilsteins only come with the FE4, or were they offered on other packages? Still can't tell all of these apart...
 


I had local shop check out my strut, they said it is fine. The old strut mount looks beefier than the new Monroe mount I bought. So I guess I'm looking into the sway bars and ends.
 
Bilsteins only came on the GXP.
I replaced everything back there except the forward lateral.

The struts were my clunk/thump.

If and when you get it figured out, post back.

Your yellow Bilsteins are no doubt original at that many miles
 
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