Terrible NVH above 5k rpm

chesster51

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I installed a lot of parts at one time and trying to isolate the main offender. I installed: Steeda stop the hop, BMR differential poly lockout bushings, vertical links and Whiteline trans insert. The vibration comes on pretty bad at around 5000 rpm and changes the whole sound of the car. I’m planning on removing trans insert first and see if it helps. All suggestions are welcome.
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Bluemustang

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My guess would be the trans insert. Diff lockout pucks typically don't do that. They'll usually just whine at a certain rpm range.
 

BmacIL

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I installed a lot of parts at one time and trying to isolate the main offender. I installed: Steeda stop the hop, BMR differential poly lockout bushings, vertical links and Whiteline trans insert. The vibration comes on pretty bad at around 5000 rpm and changes the whole sound of the car. I’m planning on removing trans insert first and see if it helps. All suggestions are welcome.
Remove the whiteline insert. You'll be good after that.
 

Chef jpd

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+1 on the trans insert.
 
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chesster51

chesster51

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It'll be coming out tomorrow. Also, just ordered a Shaftmaster one piece DS.
 

moffetts

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Good luck with the aftermarket driveshaft. They are not known to be NVH friendly.
 

GuardEcoBeast

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I have the same whiteline bushing, no vibration, but i also have an EB.
 
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chesster51

chesster51

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Removed the Whiteline bushing and really didn't think it would make much difference, but I'm very happy to say that it made a significant reduction. I'm no longer annoyed when I cross the 5000 rpm line. Curious about this though. With the bushing in place, is the vibration coming from the trans and going through the bushing and then into the trans brace? Or is their another path, like diff to DS to trans to trans brace maybe. Seems like the trans brace is common to both. Wondering if some kind of cushioning between where the brace is bolted and meets the frame might help. Maybe something like a layer or two of dynamat.
 
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chesster51

chesster51

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chesster51

chesster51

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^^^ This. ^^^
I've seen too many reviews of people drilling the hole and still having the issue. I am interested in hearing feedback from someone else who has filled the factory bushing with the product mentioned above or some other urethane product though.
 

racingmason

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Who really cares about NVH? I have long tube headers no cats and loud quad tip borlas. Above 2k RPM I dont notice anything except the exhaust and blower whine. Running race steeda diff inserts, full steeda drag package, and a barton trans mounted shifter. If I had a daily driven family base car I'd complain but Its a performance car that is steerable and stripable so idc.
 
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