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#2381330 - 10/03/17 03:44 PM trying to pin point a front end clunck
mikemee1331 Offline
master

Registered: 04/07/10
Posts: 4147
Loc: bethlehem pa
69 B-body with 440.
i recently re-bushinged (is that a word?) the front end of my Road Runner. everything was pretty much shot. i also replace the original torsion bars with the next heavier (GTX) ones. all the bushings were replaced with poly except the lower control arms and there i used rubber(to avoid the dreaded squeek)and at the suggestion of the machine shop that replaced them. all the 'hard' parts have less than 3000 miles on them and all seemed good.

now heres the issue. when i got everything back together i didn't have to mess with ride height too much as i re-installed the adjusters to the same location they were in when i pulled it apart.
the back end of the car sits high (re-sprung spring) to clear my tires, 29x15x15 fatties, and i wanted to level out the front some so i wasn't going down the road like this - \. i raised up the front via the torsion bars but now i have a clunk i didn't have when it was lower. i have searched and searched and retightened everything but i can't isolate it. everything is nice and tight. the noise has nothing to do with cornering or hitting bumps. it's like a popping/flexing noise like the shocks are loose in the front.

ANY suggestions would be helpful as i'm at a loss. just please no negatives about the ride height as i like the way it looks.

thanks guys!

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#2381333 - 10/03/17 04:10 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
Andrewh Offline
master

Registered: 02/17/03
Posts: 7627
but can you consistently reproduce the clunk, and if so when do you get it.

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#2381334 - 10/03/17 04:12 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
5spdcuda Offline
top fuel

Registered: 11/21/04
Posts: 1708
Loc: S. Il. U.S.A.
The first thing I would do is to look for any shiny spots that would indicate a point of contact. You can also try putting a small amount of grease on anything that looks like it might be close clearance as the suspension moves through it's full range of motion and see if you get a grease smear. As for ride height all I am going to say is that any new spring or re-arched leaf spring will tend to settle or take a set over the next few months. This is true for coils, torsion bars or leaf springs so don't be surprised if the car sits a little lower in time. In so far as squeaks are concerned I've found that you're much more likely to get squeaking from polys in the UCA's than you are in the lowers. I still use rubber in the lowers myself, but I have used poly on the lowers before and didn't have any problems with them.
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#2381348 - 10/03/17 04:37 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
dvw Offline
master

Registered: 03/16/06
Posts: 6583
Loc: MI, usa
Have a helper grab the roof and rock the car left to right. Grab each suspension point while it is being rocked. You will feel any point that is loose.
Doug

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#2381353 - 10/03/17 04:43 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
FurryStump Offline
top fuel

Registered: 10/15/04
Posts: 2443
Loc: Connecticut
K frame bolts tight? Don't ask me how long I chased that little annoying sound!!!! Put the wife in the car and had her steer left then right. The k frame was moving just the slightest bit. Clunk! You could barely see it! Cinched them down alls quiet!!
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#2381362 - 10/03/17 04:59 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
autoxcuda Offline
Too Many Posts

Registered: 01/20/03
Posts: 25435
Loc: So Cal
Sounds like you installed poly strut bushings. The lip that fits into the k-member can make a snapping sound when the front suspension articulates up and down a bunch like into and out of driveways.

Try loosening them, put grease around that area and bushing and re-tighten up with suspension at ride height.
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#2381386 - 10/03/17 06:14 PM Re: trying to pin point a front end clunck [Re: autoxcuda]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 32789
Loc: Lincoln Nebraska
you rebushinged it & it was good then you right away lowered it & it clunked OR you rebushinged it/lowered the ride height at the same time & now it clunks? As said I would loosen everything (as needed) & lube the needed areas then retighten.
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#2381398 - 10/03/17 06:30 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
Challenger 1 Offline
Too Many Posts

Registered: 02/05/05
Posts: 27919
Loc: Cincinnati, Ohio
Got a Go Pro camera?
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#2381401 - 10/03/17 06:35 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
mikemee1331 Offline
master

Registered: 04/07/10
Posts: 4147
Loc: bethlehem pa
all good stuff!
1)"can you consistently reproduce the clunk, and if so when do you get it." it seems to be on area of the road that make no sense what so ever. stepping on or letting off the gas does make it happen though.

2)"The first thing I would do is to look for any shiny spots that would indicate a point of contact" tried this and couldn't readily find any.

3)"any new spring or re-arched leaf spring will tend to settle or take a set over the next few months. This is true for coils, torsion bars or leaf springs so don't be surprised if the car sits a little lower in time." it's been 1 1/2 years since the springs and front were redone.

4)"Have a helper grab the roof and rock the car left to right" yep, hopefully this weekend if my son doesn't have to work.

5)"K frame bolts tight" never thought of that as i didn't have it off but it is certainly worth looking at.

6)"Try loosening them, put grease around that area and bushing and re-tighten up with suspension at ride height." i really like the sound of this. i was never really happy with the fitment and it seems like the noise is when the rode is unevenish and not really when it's bumpy. not related to bumps at all actually.

Robert - all was well until i raised the car up a few inches in the front. i never lowered it. the issue started this summer (a year after the rebuild) when i raised the front to try and level it some.





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#2381404 - 10/03/17 06:41 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 32789
Loc: Lincoln Nebraska
I don't know where I go the "lowering" from. I would do #6
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#2381407 - 10/03/17 06:48 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
stumpy Offline


Registered: 01/19/03
Posts: 28737
Loc: Grand Prairie,Texas
If it happens when you get off and on the gas I would look at the motor mounts and trans mount. Just because it happened after you redid the front end doesn't necessarily mean it's front suspension related.

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#2381420 - 10/03/17 07:03 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
71GTX471 Offline
pro stock

Registered: 01/28/03
Posts: 1204
Loc: Harriman NY
Once you decide where you want your ride height loosen the upper & lower control arm bushings preferably on a drive on lift,jounce the front end up n down & retorque the bushings at that static ride height & reevaluate it.Also retorque the K-frame bolts.

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#2381425 - 10/03/17 07:13 PM Re: trying to pin point a front end clunck [Re: 71GTX471]
ahy Offline
master

Registered: 01/22/07
Posts: 7403
Loc: IN
As mentioned, it is important to loosen everything up when significantly changing ride height. Otherwise the bushings can be pre-loaded and overload on bumps.

I would add to the suggestions, careful inspection of all bushings for any tears.

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#2381429 - 10/03/17 07:15 PM Re: trying to pin point a front end clunck [Re: 71GTX471]
mikemee1331 Offline
master

Registered: 04/07/10
Posts: 4147
Loc: bethlehem pa
Originally Posted By 71GTX471
Once you decide where you want your ride height loosen the upper & lower control arm bushings preferably on a drive on lift,jounce the front end up n down & retorque the bushings at that static ride height & reevaluate it.Also retorque the K-frame bolts.


i like this too. it has to be realigned anyway.

stumpy, all 3 are newish but i did check them any way up

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#2381477 - 10/03/17 08:45 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
Andrewh Offline
master

Registered: 02/17/03
Posts: 7627
other thing that it might be sounds like u joints.
giving it gas and letting off makes me wonder about that too.

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#2381561 - 10/03/17 10:55 PM Re: trying to pin point a front end clunck [Re: stumpy]
Frankenduster Offline
Moparts proctologist

Registered: 02/15/10
Posts: 14867
Loc: Granite Bay CA
Originally Posted By stumpy
If it happens when you get off and on the gas I would look at the motor mounts and trans mount. Just because it happened after you redid the front end doesn't necessarily mean it's front suspension related.


Boy, aint THIS the truth...
Many times in the past I have had something conk out moments after doing something else unrelated.

I rotated the tires, now I have bad breath. I should have left the tires where they were.

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#2381563 - 10/03/17 10:57 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
JonC Offline
master

Registered: 01/21/03
Posts: 3508
Loc: Millinocket, Maine
Did you grease the Torsion bar sockets, they can clunk if they are dry.
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#2381579 - 10/03/17 11:39 PM Re: trying to pin point a front end clunck [Re: JonC]
NANKET Offline
master

Registered: 12/13/03
Posts: 3743
Loc: northwest USA
Originally Posted By JonC
Did you grease the Torsion bar sockets, they can clunk if they are dry.


This right here is your noise. Factory packed them with grease. They need that to be quiet.

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#2381829 - 10/04/17 01:26 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
John_Kunkel Offline
I Live Here

Registered: 01/20/03
Posts: 18872
Loc: Rio Linda, CA
Originally Posted By mikemee1331
i also replace the original torsion bars with the next heavier (GTX) ones.


Did you grease the hex ends of the T-bars?
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#2381885 - 10/04/17 04:00 PM Re: trying to pin point a front end clunck [Re: mikemee1331]
mikemee1331 Offline
master

Registered: 04/07/10
Posts: 4147
Loc: bethlehem pa
Hmmm... i can not say with 100% certainty that i greased the front t-bars. i know i did the back but i'll have to double check the front.

U-joints i did think about and will check but they too are newish and the clunk is most definitely in the front. i can feel it in the steering wheel.

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