Front end clunk: Steering rack or control arm poly bushings?

Suspension, brake, and hydraulic/electric steering discussion.
Post Reply
Arizona9C3
Posts: 25
Joined: Wed Jul 09, 2014 6:32 pm

Front end clunk: Steering rack or control arm poly bushings?

Post by Arizona9C3 » Fri Sep 07, 2018 8:30 pm

Front end clunk on short sharp bumps or even hard quick on-off brake application (especially at lower speeds) in 2011 stock 9C3 with 55K miles (never in patrol use):

It was time for brakes so I first I changed rotors and pads and verified all correct thread locker and torque specs. Same clunk.

I've changed struts (2012 AC Delco) and poly strut bushings with new bearings (SuperPro SPF1590AK), Moog problem solver greaseable end links, but still chasing the same clunk which first developed about 3,000 miles ago.

Now I'm replacing control arms but can't find any replacements with poly bushings. Simply putting poly bushings in my current front control arms would leave me with the same ball joints, and since I'm basically replacing the whole front suspension, it seems foolish to keep the same ball joints. Does anyone have any suggestions for best front control arms and/or bushings?

I've found BMR poly bushings, BK008, for the G8 steering rack, which I assume will work. Does anyone know if they fit or have any other suggestions?

This car is not driven hard at all, just ten minute school runs around town or long road trip cruises, never any autocross or the like, so no need for super stuff suspension. But have to eliminate the dreaded clunk!
2011 Silver 9C3
2011 Black 9C3 Procharged, custom exhaust, 571 rwhp

lastcall190
Posts: 300
Joined: Mon Sep 11, 2017 10:17 am
Location: North Jersey

Re: Front end clunk: Steering rack or control arm poly bushi

Post by lastcall190 » Fri Sep 07, 2018 8:46 pm

I have found my sway bar is moving around with a fair bit of movement... my next step is sway bar bushings. Not sure if it's your issue, but your problem you are describing sounds very similar to mine. If you already replaced those, disregard this.

Good luck and let us know what you find..

-J

EDIT: I didn't answer a single question you asked... sorry about that :lol:
2012 Caprice
!DOD : LS9 Cam : Pat G : Magnaflow : VCM

2008 CVPI
168k and going strong

User avatar
sardillim
Posts: 103
Joined: Thu Apr 24, 2014 3:45 am
Location: Easton Ct

Re: Front end clunk: Steering rack or control arm poly bushi

Post by sardillim » Sat Sep 08, 2018 2:29 am

had a similar noise it was the sway bar links

paul54
Posts: 79
Joined: Sun Oct 22, 2017 1:35 pm
Location: Wilton CT

Re: Front end clunk: Steering rack or control arm poly bushi

Post by paul54 » Mon Sep 10, 2018 2:03 pm

It was the sway bar links on mine too.

Black6
Posts: 104
Joined: Wed Jan 31, 2018 12:36 am
Location: Indy

Re: Front end clunk: Steering rack or control arm poly bushi

Post by Black6 » Tue Oct 02, 2018 4:34 pm

My 14 has the same rattle when going over bumps. When I had it in the air I couldn’t find anything loose though. I’m going to probably do end links based on your guys comments. I’ll report back.
Black 2014 V8

Be jealous of my factory carpet.

Cumminsmannow
Posts: 14
Joined: Sun Sep 30, 2018 11:11 pm
Location: Monticello, MN

Re: Front end clunk: Steering rack or control arm poly bushi

Post by Cumminsmannow » Wed Oct 03, 2018 1:57 am

I was able to narrow mine down to the control arm bushings by having my wife operate the car while i watched on a creeper next to each front wheel. With her foot on the brake go from reverse to drive, and when the car pushed forward and backward with the brake applied I could watch the tire rock back and forth about 2 inches.
2012 caprice 9c1
2017 jku
2004 gr prix dd/beater

Post Reply