Go Back   MustangForums.com > Ford Mustang Tech > Suspension
Sign in using an external account
Register Forgot Password?
Search


Suspension Ask all of your general suspension questions here!

Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Knocking/creaking sound after suspension/gear install

Reply
 
 
 
 
Thread Tools Search this Thread
Old 04-02-2012, 07:30 PM   #1
Syracuse315
2nd Gear Member
 
Syracuse315's Avatar
 
Join Date: May 2009
Vehicle: 2000 Mustang GT
Location: New York
Posts: 476
Default Knocking/creaking sound after suspension/gear install

I just had the following items installed at a reputable shop, and now I'm trying to isolate a noise I'm hearing from the rear of my 2000 GT. For some background: the car has 100k miles on it, did not have the noise before the install, and the shop is 4 hours away (so taking back in is not a desirable option).

Installed Items:

- FRPP 3.73 Gears
- FRPP 31 Spline T-lok w/ carbon disks
- Moser 31 Spline Axles
- Rear end install kit + new axle seal (http://www.americanmuscle.com/rearendrebuild.html)
- MM FLSFCs
- UPR LCAs (http://www.uprproducts.com/mustang-9...trol-arms.html)
Click the image to open in full size.

I first assumed it was the gears, but after being able to replicate the same knocking/creaking sound by pressing down hard over each rear shock, I am certain it's a suspension component. The noise can be heard when slowing down from approx 10mph to a stop as well (even on smooth roads).

I know the spherical bearing can be noisy, but I don't know what the noise could sound like. I'm also thinking when the springs were reinstalled, there is a possibility the spring isolators were worn down (as they had 100k miles on them) and how they newly sit on the LCA could cause the noise as well.

Has anyone had something similar happen? The noise is livable if this is coming from the LCAs, but unnerving when I don't 100% know what it is.

Also, the new parts are awesome.
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
__________________

13.427 @ 102.6 (CALT)
Current Mods: http://mustangforums.com/forum/garag...racuse315.html
Future Mods: http://mustangforums.com/forum/4-6l-...ustang-gt.html
1986 Mercedes-Benz 190E 2.3L - RIP
Syracuse315 is offline   Reply With Quote
Old 04-02-2012, 07:44 PM   #2
BoomTown96
2nd Gear Member
 
Join Date: Jul 2011
Vehicle: 96 Mustang GT & 96 Cobra
Location: Virginia
Posts: 154
Default

I had some creaking after installing UPR LCAs on my 96 GT. I don't believe I had anything that you could call knocking though. The noise eventually went away after the bushings broke in. Not sure how long it took maybe 4-6 weeks or so. I don't know exactly whats recommended as far as lubrication but I used grease for the mounting points.
BoomTown96 is offline   Reply With Quote
Old 04-02-2012, 08:57 PM   #3
Syracuse315
2nd Gear Member
 
Syracuse315's Avatar
 
Join Date: May 2009
Vehicle: 2000 Mustang GT
Location: New York
Posts: 476
Default

Quote:
Originally Posted by BoomTown96 View Post
I had some creaking after installing UPR LCAs on my 96 GT. I don't believe I had anything that you could call knocking though. The noise eventually went away after the bushings broke in. Not sure how long it took maybe 4-6 weeks or so. I don't know exactly whats recommended as far as lubrication but I used grease for the mounting points.
That makes me feel better. I'll try to get a video of the rear while driving/stopping (my go-pro like camera I can stick underneath the car).
__________________

13.427 @ 102.6 (CALT)
Current Mods: http://mustangforums.com/forum/garag...racuse315.html
Future Mods: http://mustangforums.com/forum/4-6l-...ustang-gt.html
1986 Mercedes-Benz 190E 2.3L - RIP
Syracuse315 is offline   Reply With Quote
Old 04-03-2012, 09:42 AM   #4
Syracuse315
2nd Gear Member
 
Syracuse315's Avatar
 
Join Date: May 2009
Vehicle: 2000 Mustang GT
Location: New York
Posts: 476
Default

Just got a response from the shop, and they are sure it's the spherical bearings on the LCAs. I'm thinking of trying some grease, but the only kind I have is the white lithium used for electronics. Think it'll work/not harm anything?
Syracuse315 is offline   Reply With Quote
Old 04-03-2012, 12:21 PM   #5
UPRSharad
Sponsor
 
UPRSharad's Avatar
 
Join Date: Jul 2011
Vehicle: 2011, Ford, Mustang GT
Location: FL
Posts: 2,503
www.facebook.com/sraldiris
Default

Sphericals don't make noise unless they're completely worn out and loose. (then it's kind of a popping sound) They do, however, TRANSMIT more noise than rubber or poly bushings. In other words, you may not have noticed gear whine in your ring and pinion or clunking in your driveshaft before installing the LCAs, and those sounds may be more noticeable now with the LCAs. But the LCAs themselves shouldn't make ANY noise if they are installed properly. Do you know if the shop lubricated the poly bushings on the LCAs with synthetic grease before they were installed? This is standard procedure, and if they're a reputable shop, they would do this without being told to do so.

BTW, spray lube will not harm the sphericals.
__________________

Like us at www.facebook.com/TeamUPR
Follow us on Instagram @uprproducts
UPRSharad is offline   Reply With Quote
Old 04-03-2012, 02:19 PM   #6
Syracuse315
2nd Gear Member
 
Syracuse315's Avatar
 
Join Date: May 2009
Vehicle: 2000 Mustang GT
Location: New York
Posts: 476
Default

Quote:
Originally Posted by UPRSharad View Post
Sphericals don't make noise unless they're completely worn out and loose. (then it's kind of a popping sound) They do, however, TRANSMIT more noise than rubber or poly bushings. In other words, you may not have noticed gear whine in your ring and pinion or clunking in your driveshaft before installing the LCAs, and those sounds may be more noticeable now with the LCAs. But the LCAs themselves shouldn't make ANY noise if they are installed properly. Do you know if the shop lubricated the poly bushings on the LCAs with synthetic grease before they were installed? This is standard procedure, and if they're a reputable shop, they would do this without being told to do so.

BTW, spray lube will not harm the sphericals.
Sounds similair to what I found in a different thread (Although it was regarding a Panhard Bar vs Watts):

Quote:
Originally Posted by Sam Strano View Post
First, tubular control arms themselves can act as sound tubes carrying axle or rod-end noise to the body, up the arm. Kind of like if you held a paper towel tube or a glass to a wall...

Noise from LCA's is not uncommon... and you'll find that to be the case when you talk to others.
My only remaining question is why can I hear the noise while out of the car and pressing down on the rear suspension? I'm assuming the gears and aluminum drive shaft are stationary at that point.

Also, checking the bushings before install, I noticed grease already in the poly bushings. I'm not sure if they added any more, but should they have?
__________________

13.427 @ 102.6 (CALT)
Current Mods: http://mustangforums.com/forum/garag...racuse315.html
Future Mods: http://mustangforums.com/forum/4-6l-...ustang-gt.html
1986 Mercedes-Benz 190E 2.3L - RIP
Syracuse315 is offline   Reply With Quote
Old 04-03-2012, 07:58 PM   #7
Syracuse315
2nd Gear Member
 
Syracuse315's Avatar
 
Join Date: May 2009
Vehicle: 2000 Mustang GT
Location: New York
Posts: 476
Default

Here is the video from underneath the car. The camera was mounted on the rear stabilizer facing the LCAs, but swung 180 degrees while driving. The noise can still be heard briefly at 0:38 and more clearly at 1:00.

At 1:14 I jumped up and down once in the seat and you can hear the noise again.

http://www.youtube.com/watch?v=Q-Jex3N9mwM
Syracuse315 is offline   Reply With Quote
Old 04-04-2012, 11:41 AM   #8
Syracuse315
2nd Gear Member
 
Syracuse315's Avatar
 
Join Date: May 2009
Vehicle: 2000 Mustang GT
Location: New York
Posts: 476
Default

Looking over Jazzer's suspension thread:

"*I prefer that if an LCA have a non-spherical bearing, it be on the axle end. This will create more NVH than the reverse, but I happen to like the relationship between an OEM type rear sway-bar and plate in which it mounts."

That is how my LCAs are now set up as well. Could be another reason for the noise (See pictures below). I've also taken some pictures of the spring isolators and they look in decent shape:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
Syracuse315 is offline   Reply With Quote
Old 04-04-2012, 07:53 PM   #9
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

I'm with Sharad on this one..... Click the image to open in full size. I mean, I'm not with Sharad, as we are both married, but not to each other Click the image to open in full size. ...not that there is anything wrong with that Click the image to open in full size.

I don't hear anything unusual, but that pair of sphericals is going to transmit noises you may not have ever heard and maybe there all along, as Sharad said. Run around in my car for a while and will hear plenty of stuff like that. Hell, you have 2 sphericals, where I have 13 of them babies and several more that are metal on metal, just not a "spherical" bearing.

Seriously, I don't hear anything unusual, so as long as the bolts are tight and suspension is sound, I don't know that I would worry about it.

Jazzer
Jazzer The Cat is offline   Reply With Quote
Old 04-04-2012, 08:24 PM   #10
UPRSharad
Sponsor
 
UPRSharad's Avatar
 
Join Date: Jul 2011
Vehicle: 2011, Ford, Mustang GT
Location: FL
Posts: 2,503
www.facebook.com/sraldiris
Default

Quote:
Originally Posted by Syracuse315 View Post
Here is the video from underneath the car. The camera was mounted on the rear stabilizer facing the LCAs, but swung 180 degrees while driving. The noise can still be heard briefly at 0:38 and more clearly at 1:00.

At 1:14 I jumped up and down once in the seat and you can hear the noise again.
Okay first of all, that video sounded awesome through my headphones!

Now, about the noise... hmmm... I don't know man. That popping noise at the end of the video, say from around 1:02-1:18 does kinda sound like worn out sphericals, but if those LCAs are new, they would NOT be worn out. They might do that after several YEARS, but not after several hours.

Regardless, those LCAs are guaranteed for life, so if you bought them new and they need new sphericals, we would just send them to you. That said, I just don't think this is the case. You could reach under there with the car parked and push/pull side to side and to see if you can replicate the sound?


Quote:
Originally Posted by Jazzer The Cat View Post
I'm with Sharad on this one..... Click the image to open in full size. I mean, I'm not with Sharad, as we are both married, but not to each other Click the image to open in full size. ...not that there is anything wrong with that Click the image to open in full size.

I don't hear anything unusual, but that pair of sphericals is going to transmit noises you may not have ever heard and maybe there all along, as Sharad said. Run around in my car for a while and will hear plenty of stuff like that. Hell, you have 2 sphericals, where I have 13 of them babies and several more that are metal on metal, just not a "spherical" bearing.

Seriously, I don't hear anything unusual, so as long as the bolts are tight and suspension is sound, I don't know that I would worry about it.

Jazzer
HAHAHAHAHA!!!! There's hardly a day that goes by where I don't laugh OUT LOUD over your posts. You're not right dude!
__________________

Like us at www.facebook.com/TeamUPR
Follow us on Instagram @uprproducts
UPRSharad is offline   Reply With Quote
Old 04-04-2012, 10:42 PM   #11
Syracuse315
2nd Gear Member
 
Syracuse315's Avatar
 
Join Date: May 2009
Vehicle: 2000 Mustang GT
Location: New York
Posts: 476
Default

Quote:
Originally Posted by Jazzer The Cat View Post
Run around in my car for a while
Will do!


Quote:
Originally Posted by Jazzer The Cat View Post
Seriously, I don't hear anything unusual, so as long as the bolts are tight and suspension is sound, I don't know that I would worry about it.
Jazzer
That's what I was looking to hear.

Quote:
Originally Posted by UPRSharad View Post
Okay first of all, that video sounded awesome through my headphones!
Thanks! The joy of having an external microphone on the camera. That was just a run up to 3k RPMs, so I'll get a full blast one tomorrow.

Quote:
Originally Posted by UPRSharad View Post
Now, about the noise... hmmm... I don't know man. That popping noise at the end of the video, say from around 1:02-1:18 does kinda sound like worn out sphericals, but if those LCAs are new, they would NOT be worn out. They might do that after several YEARS, but not after several hours.
I checked over the sphericals before the install and they looked spotless/shiny. I don't know how they could be worn out.

Quote:
Originally Posted by UPRSharad View Post
You could reach under there with the car parked and push/pull side to side and to see if you can replicate the sound?
I had success replicating the noise more from up and down pushing, but I'll get both directions on video tomorrow (Hopefully with more light and with the camera/mic pointed at the spherical ends.
Syracuse315 is offline   Reply With Quote
Old 04-05-2012, 07:13 AM   #12
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

Quote:
Originally Posted by Syracuse315 View Post
"...
Thanks! The joy of having an external microphone on the camera. That was just a run up to 3k RPMs, so I'll get a full blast one tomorrow... "
You'll likely only peg the VU and mic won't pick it up, but give it a try. Just please MAKE SURE you are in a VERY well open area in the middle of nowhere and NOT in a residential or populated area.

Jazzer
Jazzer The Cat is offline   Reply With Quote
Old 04-05-2012, 07:59 AM   #13
Syracuse315
2nd Gear Member
 
Syracuse315's Avatar
 
Join Date: May 2009
Vehicle: 2000 Mustang GT
Location: New York
Posts: 476
Default

Jazzer, this is my typical "mess around" spot, the benefits of living near a huge swamp:

Click the image to open in full size.

Or I could just put it in neutral and rev it in the parking lot
Syracuse315 is offline   Reply With Quote
Old 04-05-2012, 10:13 AM   #14
Syracuse315
2nd Gear Member
 
Syracuse315's Avatar
 
Join Date: May 2009
Vehicle: 2000 Mustang GT
Location: New York
Posts: 476
Default

A couple other questions, mostly related to weight savings:

What are these two black objects for? One feels like a big rubber block, maybe for sound dampening? Can I remove either?

Click the image to open in full size.

Quad shocks can now be removed because of the new LCAs? (I'm assuming yes from the suspension sticky)

Is there any harm removing the big weight attached to the bottom of the axle housing?
Syracuse315 is offline   Reply With Quote
Old 04-05-2012, 10:41 AM   #15
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

The "Dogbone" is a vibration dampner and can safely be removed without harm in any way. May hear a bit more noise out back, but will be fine.

yes... yank the quads!

I like your "mess around" spot, as way too many use common streets instead.

Jazzer
Jazzer The Cat is offline   Reply With Quote
Old 04-05-2012, 02:31 PM   #16
Syracuse315
2nd Gear Member
 
Syracuse315's Avatar
 
Join Date: May 2009
Vehicle: 2000 Mustang GT
Location: New York
Posts: 476
Default

Quote:
Originally Posted by Jazzer The Cat View Post
I like your "mess around" spot, as way too many use common streets instead.
Yea, I'd rather not have to deal with the cops when I do stuff like this:

http://www.youtube.com/watch?v=9EnFhPw-H6o

Syracuse315 is offline   Reply With Quote
Old 04-05-2012, 09:47 PM   #17
Syracuse315
2nd Gear Member
 
Syracuse315's Avatar
 
Join Date: May 2009
Vehicle: 2000 Mustang GT
Location: New York
Posts: 476
Default

Quote:
Originally Posted by Syracuse315 View Post
I had success replicating the noise more from up and down pushing, but I'll get both directions on video tomorrow (Hopefully with more light and with the camera/mic pointed at the spherical ends.
And now the video:

http://www.youtube.com/watch?v=s1fcOfjHrns


Any idea about the two black boxes in post #14?
Syracuse315 is offline   Reply With Quote
Old 04-06-2012, 05:33 PM   #18
UPRSharad
Sponsor
 
UPRSharad's Avatar
 
Join Date: Jul 2011
Vehicle: 2011, Ford, Mustang GT
Location: FL
Posts: 2,503
www.facebook.com/sraldiris
Default

Quote:
Originally Posted by Syracuse315 View Post
And now the video:

http://www.youtube.com/watch?v=s1fcOfjHrns


Any idea about the two black boxes in post #14?
Woah. Now I'm stumped. The knocking with the side to side motion from :10 on eliminates the sphericals as the culprit, in my opinion.

Does it still have the stock UCAs?

About the black boxes... there was a weight reduction thread on modulardepot.com about ten years ago... I believe they were listed there, but I don't remember the details.
__________________

Like us at www.facebook.com/TeamUPR
Follow us on Instagram @uprproducts
UPRSharad is offline   Reply With Quote
Old 04-06-2012, 06:47 PM   #19
Old Mustanger
3rd Gear Member
 
Old Mustanger's Avatar
 
Join Date: Jan 2012
Vehicle: 1997 SVT Cobra
Location: IL
Posts: 615
Daniel Merrill
Default

I'm with you on this, something is not quite right.
Either 2 parts are interfering or something is loose. Sphericals do not make noise when new.

Maybe you could replicate the video with the camera pointing at different components? And different directions? It might take a few tries, but you should be able to find the culprit.

Good luck.
__________________
Owned 32 Mustangs & Counting.

Fondest memories: 1969 428CJ, it was stolen 60 days after complete rebuild.....
Worst memory: 1965 Notch back, rolled end over end, 2 days after rebuild, fractured Strut-bar..... Lesson learned: ALWAYS upgrade the front suspension of an early Mustang!
Worst mustang: 1974 4-cyl auto (it was cheap, I was broke...).
Favorite body style 1965/66 Fastback.
Present stable: 1997 SVT Cobra, 50k miles, Paciffic Green w/ tan leather & lots of goodies.
Old Mustanger is offline   Reply With Quote
Old 04-06-2012, 07:19 PM   #20
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

I agree with Old and what I was gonna say. My first thought, was that something is loose. Just get it up on a set of blocks and climb under there with a buddy moving it just like you are in the vid. Use a stethoscope or hollow tube up against different parts to isolate the location of noise.

You will find it, as it will not be mistakeable.

Jazzer
Jazzer The Cat is offline   Reply With Quote
Old 04-06-2012, 07:19 PM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Tags
00, 373, 94, florida, gear, install, knock, mustang, noise, rattling, rear, slowing, south, suspenion, suspension, swap, syspension

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 10:28 PM.

© Internet Brands, Inc.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup