front suspension hollow sound over bumps

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Old 04-23-2019, 09:59 PM
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front suspension hollow sound over bumps

Hi, my 04 G35 Coupe with sport package, I just had the front uppers, and both front lower control arms (Moog) along with ball joints and KYB front struts and new Moog strut mounts all replaced along with alignment and new tires. I am still hearing a hollow thump when I go over bumps at slow speeds in front end. The car feel new after I replaced all that I did but still does not feel quit right, any ideas what else can cause that hollow thump? You dont feel it in the steering wheel, you just hear it. My 07 does not do that at all.
 
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Old 04-24-2019, 09:22 AM
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Hollow? Doesn't affect steering? Maybe take a look at the hollow, not connected to steering sway bar and components (end links, mounts)?
 
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Old 04-24-2019, 12:12 PM
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I spent a couple hours last night reading threads, seems this is a common issue but not sure if anybody has actually solved it without guessing at parts? I feel like maybe its the compression rod bushings? Its not when turning, its just low speed, leaving driveway over a bump you hear a hollow thump/faint, but does not affect steering wheel.
 
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Old 04-24-2019, 12:58 PM
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Oh, you have old compression rods with rubber bushings? Replace with new parts and whiteline bushings, that will definitely improve things. The only way to do this without guessing is to actually inspect your suspension, which I can't do for you over the internet unfortunately.
 
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Old 04-24-2019, 01:41 PM
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Looking at my order from rock auto, and I had replaced both the lower control arms, one facing rear and one facing toward front along with uppers and KYB struts and mounts. It looks like the one facing toward front has that compression rod bushing with that part already? So I am wondering if that is new already or if the compression rod bushing is a different part all together and is not inside either lower control arms listed below?
Here is the part I purchased and mechanic put on car (Both sides):

MOOG RK621373 R-Series; Complete Arm w/ Ball Joint InfoFront Left Lower Rearward; CoupeMOOG RK641595 R-Series InfoFront Left Lower Forward; RWD
 
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