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Old 04-02-2012, 07:30 PM   #1
Syracuse315
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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.
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Old 04-02-2012, 07:44 PM   #2
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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.
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Old 04-02-2012, 08:57 PM   #3
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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).
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Old 04-03-2012, 09:42 AM   #4
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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?
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Old 04-03-2012, 12:21 PM   #5
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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.
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Old 04-03-2012, 02:19 PM   #6
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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?
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Old 04-03-2012, 07:58 PM   #7
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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
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Old 04-04-2012, 11:41 AM   #8
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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.
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Old 04-04-2012, 07:53 PM   #9
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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.

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Old 04-04-2012, 08:24 PM   #10
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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
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Old 04-04-2012, 08:24 PM
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