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      09-14-2019, 02:47 AM   #1
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Drives: E92 & F80 M3
Join Date: Nov 2014
Location: CA

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Anyone go with solid subframe + 75D diff bushing?

Hello huys.

Did a lot research that most of M3 owners go with solid subframe + 95A diff bushing.

I'm wondering if anyone set with solid subframe + 75D diff bushing?

Would the 75D diff bushing make crazy whine sound?

thank you.
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      09-14-2019, 06:21 AM   #2
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Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

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Yes. 80A whines some and 95A whines more, so 75D will be worse. If you have a convertible, the extra sound deafening and reinforcements may help. I have 85A and would not go stiffer but drove a convertible once that had solid diff bushings and the whine was not too much.
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