Drivers side front *thunk*
Thread Starter
Holley HP EFI w/TPI
Joined: May 2009
Posts: 553
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From: Kanata ON
Drivers side front *thunk*
I've used speed bumps to narrow down where the thunk is coming from drivers side front.
It can be heard if I go over a speed bump, or when I am applying the brakes at a slow speed.
I installed the VBP front monospring + sway and the rack attack over the winter.
Last night I got under the car and checked all the nuts/bolts, everything is snug.
Any thoughts as to what could be causing the thunk?
It can be heard if I go over a speed bump, or when I am applying the brakes at a slow speed.
I installed the VBP front monospring + sway and the rack attack over the winter.
Last night I got under the car and checked all the nuts/bolts, everything is snug.
Any thoughts as to what could be causing the thunk?
Race Director
Joined: May 2006
Posts: 16,528
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From: Dayton, Ohio
Thread Starter
Holley HP EFI w/TPI
Joined: May 2009
Posts: 553
Likes: 0
From: Kanata ON
took the wheel off, nothing appears loose or missing.
Jacked up the spindle to see if i could see anything shift.
Nothing is loose.
Could something in the breaking system be making the noise?
Jacked up the spindle to see if i could see anything shift.
Nothing is loose.
Could something in the breaking system be making the noise?
Race Director
Joined: Feb 1999
Posts: 19,659
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From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
Same thing happened to mine when my wife and I were out on a cruise about 60 miles from home. All the shims on the driver side fell out of the upper control arm allowing the arm to move in and out on the studs making the thumping noise in my car.
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Thread Starter
Holley HP EFI w/TPI
Joined: May 2009
Posts: 553
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From: Kanata ON
Drifting
Joined: Jun 2008
Posts: 1,495
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From: Blanco County, TX
I think everybody else has covered the first places to check, but I had this problem...going over a speed bump at a "normal" speedbump speed and I'd get a clunk. If I eased over it, nothing. My problem was the upper control arm hitting the frame. The car had BB springs, and I have a light SB (ZZ4). My ride height was about 2" too high (avatar picture). I put in a SB front spring, problem solved. My bushings were all new from the first attempt to fix the problem.
Not sure how the new monospring is affecting this, but look for evidence of the UCA hitting the frame.
Not sure how the new monospring is affecting this, but look for evidence of the UCA hitting the frame.
Race Director
Joined: Jul 2001
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Upper control arm shims, open the hood and look at the mounting point of the arm to the frame.
Thread Starter
Holley HP EFI w/TPI
Joined: May 2009
Posts: 553
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From: Kanata ON
1) took the wheel off and jacked up the suspension, didn't see any movement at all.
2) grabbed the spindle and tried to shake the hell out of it, to see if I could make the A-Arm (or anything for that matter) move.
Everything was tight.
Thread Starter
Holley HP EFI w/TPI
Joined: May 2009
Posts: 553
Likes: 0
From: Kanata ON
Nuts are tight, shims are in place except for one, but i'm sure there weren't any when it came back from the alignment shop.
Bushing bolts are tight as well.
A-arms do show marks where they have hit the shock tower (firewall side), but that's a pretty extreme angle I'd think and I'm wondering if that happened when I was installing them.
went for a test drive after, thunk is there when I brake, as if something is shifting.
Bushing bolts are tight as well.
A-arms do show marks where they have hit the shock tower (firewall side), but that's a pretty extreme angle I'd think and I'm wondering if that happened when I was installing them.
went for a test drive after, thunk is there when I brake, as if something is shifting.
Le Mans Master
Joined: Jan 2000
Posts: 8,918
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From: New Hill NC
Nuts are tight, shims are in place except for one, but i'm sure there weren't any when it came back from the alignment shop.
Bushing bolts are tight as well.
A-arms do show marks where they have hit the shock tower (firewall side), but that's a pretty extreme angle I'd think and I'm wondering if that happened when I was installing them.
went for a test drive after, thunk is there when I brake, as if something is shifting.
Bushing bolts are tight as well.
A-arms do show marks where they have hit the shock tower (firewall side), but that's a pretty extreme angle I'd think and I'm wondering if that happened when I was installing them.
went for a test drive after, thunk is there when I brake, as if something is shifting.
Le Mans Master
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
I would suggest you open the hood, support it well and make your stops while sitting high in the seat and watching the action of the control arms. Sorta hard for us to guess, when everything we suggest is new and you think its tight and correct.
Race Director
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I'm betting alignment shims too, do you have 2 on one bolt and 1 on the other ? Then the 4 one is on the alignment rack, it would hard to simulate a 3000 lb car going over a bump. 
