Rear Passenger Knock - Mustang Evolution

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Old 01-08-2015, 10:06 AM   #1
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Rear Passenger Knock

Hi everyone. I'm experiencing a really bad knocking from the rear passenger side of my car (2014 GT Auto). I have recently lowered it (Steeda Ultrlites, Whiteline adjustable LCAs, Whiteline adjustable panhard, Whiteline relocation brackets) and have checked and re-checked all the jam nuts and torque on all bolts, sway bar is tight, axlebacks don’t make any noise when I bang on em. I'm just baffled at this point. Any ideas would be awesome, thanks.
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Old 01-08-2015, 10:13 AM   #2
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What kind of knocking because I'm experiencing sort of a squeaking/rattling sound coming from the same area when I get on the gas. Roush axel back and SR performance springs w/ j&m pan hard bar. Everything looks good to me as well


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Old 01-08-2015, 10:20 AM   #3
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I get a rattle too when I'm going down the freeway, but when I hit a bump or just go down an uneven road I get the knock, it sounds like something is loose, but I can't find anything that is.
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Old 01-08-2015, 10:30 AM   #4
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You didn't list that you check the upper shock mounts so I would start with checking to make sure you have all the bushings in place or maybe just not tight enough

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Old 01-08-2015, 10:35 AM   #5
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I have checked them as well. Actually took them off last night and put them back on, no difference in sound.
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Old 01-08-2015, 10:46 AM   #6
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Could possibly be my problem. Haven't checked that. Is there a high probability that's what it is?


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Old 01-08-2015, 12:29 PM   #7
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I doubt it, but it couldn't hurt to check and they are easy enough to get to.
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Old 01-08-2015, 01:31 PM   #8
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Check the pan hard bar support brace. Should be able to replicate noise by hitting it. The bushing on the new pan hard bar might be stiffer/bigger keeping the support brace from getting tight enough.

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Old 01-08-2015, 02:06 PM   #9
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I haven't checked that. Will for sure. Thanks


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Old 01-08-2015, 02:17 PM   #10
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Endlink. I went crazy trying to diagnose a similar issue. Jack the rear up and jam the endlink with your palm. Compare sides. You won't make as loud of a noise but if this is the problem you will hear the play in the bushing. But only on the bad side.


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Old 01-08-2015, 03:30 PM   #11
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I smacked on the middle of the swaybar and didn't hear anything. I'll try hitting right on the endlink. Thanks for the reply!
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Old 01-09-2015, 01:15 PM   #12
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How did you adjust your rear pinion angle with the new control arm?

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Old 01-18-2015, 01:26 AM   #13
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Did you ever find the noise?

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Old 01-18-2015, 02:13 AM   #14
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Mine makes a knock sound like that. I'm also lowered and have all BMR stuff besides springs. It seems
To my like the sound comes from the area in between the passenger side rear wheel and the door. But I can't seem to find it. Also it does it only
Sometimes, and I noticed it if I'm parking and I slam the brakes only going
Forward. It won't do it in reverse for me.


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Old 01-18-2015, 10:07 AM   #15
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Still have the noise and if anything it happens more frequently now


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Old 01-18-2015, 04:58 PM   #16
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Check the adj. panhard bar. I had a bad noise after an alignment because it wasn't tightened fully. I was able to replicate the noise by flexing the bar.
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Old 01-18-2015, 09:25 PM   #17
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Do you have an adjustable upper control arm? My car was making the same rattling noise from that area and I found out that my UCA was backed out 5 to 6 turns, as it came loose during a track day.
I retightened it and reset the pinion angle. In addition, I re-greased all of my suspension parts. The problem was resolved.


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Old 01-18-2015, 10:24 PM   #18
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No. This has been happening since I got the car and when I got it I was convinced my exhaust was rattling something because it would only happen when I would hit it. Now it happens if I moderately gas it


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Old 01-18-2015, 10:35 PM   #19
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Do you know if you have any poly bushings? They require grease periodically to keep them quiet.


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Old 09-24-2015, 03:57 PM   #20
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Quote:
Originally Posted by Ammermeow View Post
Check the pan hard bar support brace. Should be able to replicate noise by hitting it. The bushing on the new pan hard bar might be stiffer/bigger keeping the support brace from getting tight enough.

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If this is the issue, what would be a fix? I ask because this might be my problem, I have the J&M Adjustable Panhard and I can replicate the clunk right where you suggested.
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Old 09-24-2015, 04:15 PM   #21
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I had the exact same knock, it ended up being the lower shock mount, just tightened it up and it went away
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Old 10-03-2015, 01:48 AM   #22
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Quote:
Originally Posted by hwebb78 View Post
If this is the issue, what would be a fix? I ask because this might be my problem, I have the J&M Adjustable Panhard and I can replicate the clunk right where you suggested.
Shim the brace with a thin washer.

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Old 10-04-2015, 02:16 AM   #23
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Make sure relo brackets arent rubbing against the rear sway bar thats what happened to mine


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Old 10-04-2015, 02:56 AM   #24
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When does the noise happen? Over bumps? Cruising? Turning?
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