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Old 02-26-2015, 02:30 PM   #1
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Characteristics of sound related issues: post suspension

Alright, speaking toward suspension parts, since most here will probably do at least springs, PHB, and LCA like I did, I got a few issues I've noticed appear in regards to NVH.

I did ford K springs first with the PHB and had no NVH Issues. Rear end makes more noise(clunk like) when I hit any bumps though.

I installed BMR no adjustable LCA and now I can hear more. Maybe someone can chime in on where I should really start diagnosing the issues.

Issues amplified are whine from rear end when accelerating or decelerating. Doesn't seem to be axle or gear whine though?

When cornering slightly and hitting a bump, squeaks in rear end.

Everytime I switch gears and engage the gas, clunk is heard on rear end. Always. Louder now apparently, LCA amplify that sound?

Right now regretting this for DD purposes and probably gonna put stock LCA back on unless I really need new shocks cause of the springs? Just need to smooth it out a bit so it doesn't feel like I'm driving a junket, ya know? Everything is tighten down to spec. I may of overgreased but that's it.

Long post. Sorry.


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Old 02-26-2015, 02:32 PM   #2
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What are characteristic LCA noises? Failure noises? Bushing failure noises? Maybe I might start there and clean/degrease??


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Old 02-26-2015, 02:42 PM   #3
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Mine does the exact thing. The whine is annoying. You really start to hear it around 35mph and louder as you go up in speed. Even on deceleration you hear it. I wonder if any of the other brands of lca will do this? I have the same as you bmr. But I have eibachs springs and a BMR uca and bracket. Along with relocation brackets for the Lcas bmr panhard as well.


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Old 02-26-2015, 02:43 PM   #4
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Mine also clunks like heck when I let off the throttle and get back on the throttle. I have an auto with 3.15s and it never clunked until I did all new control arms and upper arm.


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Old 02-26-2015, 02:46 PM   #5
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I just didnt know how normal it was. I have 3:31 and I hear every change in axle acceleration


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Old 02-26-2015, 02:47 PM   #6
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I had a camaro last and it didn't do this -__- I guess the perks of being a live axle? Lol


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Old 02-26-2015, 02:49 PM   #7
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It's very annoying right? But I did see a thread in here where some guys had damaged poly bushings. I wonder if maybe that's our problem? Bmr was replacing them for free as far as I know


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Old 02-27-2015, 07:32 AM   #8
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Did you grease them ?

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Old 02-27-2015, 01:28 PM   #9
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Yes


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Old 02-27-2015, 01:41 PM   #10
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Not trying to sound like a d*** but you know when changing all that stuff out you are going to hear more noise and get more vibrations, there is a reason auto manufacturers put soft and squishy bushings in instead of better quality stuff. They know you will never buy something that rides like a brick. Just something to keep in mind when putting that stuff on there , there is always a sacrifice.

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Old 02-27-2015, 01:45 PM   #11
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When I lowered mine I put in an adjustable PHB with poly bushings. It really didn't make any new noises, except the front end.
I've always had a clunk although if I shift carefully it's not noticeable and I've attributed this to the two piece drive line which I think is a piece of junk. I ordered a one piece drive line.
When I put the LCA's in I did notice more noise and although my rearend has always whined (I have 3.73's) it is worse with the LCA's. I just attributed it to being more solidly attached to the body with the stiffer poly bushings. Mine only whine on acceleration not letting off the gas.
I will not put the adjustable UCA in until I get the one piece driveline.............and reset the pinion angle, then I'll see if it makes any difference.
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Old 02-27-2015, 03:06 PM   #12
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What bushings did you go with on LCA if metal that will give you more NVH. Its like SSTHIS said the harder and tighter we make them the more you will hear NVH. Ford makes every thing soft for a DD.
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Old 03-17-2015, 08:25 PM   #13
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Quote:
Originally Posted by WhiteCali5oh View Post
Mine also clunks like heck when I let off the throttle and get back on the throttle. I have an auto with 3.15s and it never clunked until I did all new control arms and upper arm.


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same issues here. I'm thinking its the torque on the uca bolts. double check it. mines was loose but cant get in there yet to re torque them. i'll re post after i do.
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Old 03-17-2015, 08:40 PM   #14
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I only have the bmr lca's currently and I have some slight clunking as well. I torqued to spec and greased.
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Old 03-17-2015, 08:42 PM   #15
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I'd be ok with the clunking if I knew it's not hurting anything.


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Old 03-18-2015, 07:51 AM   #16
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You need a one piece driveshaft to get rid of the clunk.

I recall reading on one of the AM reviews for a pair of rear LCA's that people who installed them noticed increase clunking from the (stock) DS afterwards.

FWIW, I didn't notice any increase in whine or noise after having my rear LCA's installed.

I'm of the opinion that if you can hear increased NVH then your exhaust isn't loud enough.

Seriously though, my exhaust is fairly loud.. and I rarely roll with the windows up... and I typically have the stereo on....so with those 3 things combined I rarely notice any increase in NVH.
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Old 03-18-2015, 09:49 AM   #17
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When checking my LCA's again and making sure there torqued to 129lbft I also looked at the pan hard bar. When I lowered the car and put in the LCA's and pan hard bar I used all new Ford nuts and bolts with the exception of the drivers side pan hard bar nut. It looked like it was a little loose so I re-torqued it again.....and before reaching 129lbft the nut stripped..............I guess there is a reason why Ford says to use the suspension hardware only once.................lesson learned.
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Old 03-18-2015, 05:55 PM   #18
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So the single clunk is normal? Is it hurting anything?


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Old 03-18-2015, 07:27 PM   #19
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BMR LCAs, UCA w/new bracket, relocation brackets on LCAs, torqued to spec. Track pack Mustang GT with FRPP handling kit with adjustable dampers and shocks. No clucking, knocking, nada. SCT 93 Octane tune daily driver. F'n amazing car!!!!!!!!


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