Quote:
Originally Posted by M43S7RO
Interesting to me that some people get increased diff whine. I went with the purple diff bushings and have a hard time hearing an increase in whine. Almost makes me wish I had just gone for solid, I opted for purple because of reports of whine I had read so wanted to play it safe. Are you manual? Maybe the gear box type makes a difference.
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I drove a convertible 6MT car with solid subframe and diff bushings and heard no whine while the top was down and a barely perceptible whine while the top was up. Could be either that convertibles have better sound deadening or that they are noisier and the existing noise drowns out the diff whine.
I run 75D subframe and 95A diff bushings in my 6MT E90 and I definitely hear diff whine. You cannot miss it in the speeds and gears it is present. I wish it was a little less audible. I also have a one piece carbon fiber driveshaft and maybe that makes a difference.