Petty's Rear Strut Brace - Help me diagnose a rattle - Dodge Challenger Forum: Challenger & SRT8 Forums

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post #1 of 9 (permalink) Old 03-15-2017, 07:07 PM Thread Starter
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Petty's Rear Strut Brace - Help me diagnose a rattle

Hello y'all, installed the petty's garage rear strut brace a few days ago and have been troubleshooting a rattle on the drivers side (rear of course). I have the brace installed correctly after viewing several threads on here and youtube videos because the pics in the instructions that came with the brace were not sufficient. Each nut has been torqued per instructions, there were no noticeable loose parts and the mounts sit flush on the shock mounts. i attempted to muscle the brace to see what is rattling but it is solid as a rock as it sits. The rattle is definitely on the drivers side.

In the process of troubleshooting i removed only the drivers side cups, washers and nuts and drove around and now the car is quiet as stock, so there has to be something with the hardware i would think. After removing the hardware several times i have damaged the threads (sits above where the nut is tightened all the way down so should not be a loose nut) so will be chasing those threads to clean it up and will get new lock nuts, in the meantime the drivers side mount is not bolted down and there is no noise whatsoever.

Does anyone have any similar experiences and if so what did you do to fix it? Thanks in advance!

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post #2 of 9 (permalink) Old 03-15-2017, 09:39 PM
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Yep, You might want to put a piece of rubber to isolate it on both sides. I did this and the rubber was about a 1/4 inch thick between where it sits metal to metal. I had to do this to the front brace as well.


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post #3 of 9 (permalink) Old 03-17-2017, 11:01 AM Thread Starter
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Yep, You might want to put a piece of rubber to isolate it on both sides. I did this and the rubber was about a 1/4 inch thick between where it sits metal to metal. I had to do this to the front brace as well.
thanks for the idea. just to clarify, did you place the rubber bushing underneath the brace where it meets the shock mount and on top of the brace but underneath the metal cup? Do you have any pics of your install by chance?
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post #4 of 9 (permalink) Old 03-17-2017, 11:05 AM
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Yes I cut the rubber to sit between the brace and shock mount. I did the same on the strut tower brace as well. I don't have any pics because I sold the car. Hope this helps.
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post #5 of 9 (permalink) Old 03-19-2017, 06:32 PM Thread Starter
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so after adding rubber bushings and retightening the nuts i took it for a test drive and the trunk sounded like the trunk was open or i had a box of tools in the trunk and would rattle over bumps. checked that and of course trunk was closed. Took another look at the hardware and it was tight. Drove again sounded the same. Took all the hardware off of the shock mounts and left the the brace attached by the seat mounts. Now it is quiet as can be. This doesn't make a lot of sense to me, rattling like crazy when everything is torqued down and quiet as can be without it. would there be any harm in letting it be as is? gonna give Petty's Garage a call tomorrow to get their take on it.
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post #6 of 9 (permalink) Old 03-19-2017, 06:36 PM
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I would give them a call. Sounds like something out of alignment with with the brace or the car. It sounds crazy but you would be surprised how much the tolerances are off from the factory. I hope that is not the case. Maybe Petty will send you a new brace. I'm out of ideas. I hope it all works out for you.
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post #7 of 9 (permalink) Old 03-20-2017, 08:14 PM Thread Starter
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so in the process of troubleshooting this, i looked in the wheel well and noticed as i tighten the nuts on top of the brace part of the shock mount bolts back out a little which causes the part that is holding up the strut to rattle. will be taking off the wheels so i can get a wrench under there and hold it while i tighten it from inside the trunk. I recently lowered the car, so not sure if that has anything to do with it. Will post up afterwards if that cured my problem.
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post #8 of 9 (permalink) Old 03-20-2017, 08:18 PM
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Hope that works. Please keep us posted. Fingers crossed
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post #9 of 9 (permalink) Old 03-21-2017, 11:16 AM
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Got mine out of the barn last night and drove it and also drove it to work this morning and I experienced no rattling or any unusual noises. This was the first time driving it since the install...

2016 Challenger Scat Pack Shaker - Go Mango! Hurst Elite Series Cat Back exhaust, Petty Garages front and rear shock tower braces, Moroso catch can, 84mm throttle body, Hurst shifter.

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