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Probably in the set-up, but to tell you the truth I never had great success in setting up 4.10 or higher gears in 8.75's that were "quiet". Seemed to always have a noise at some rpm or another. I just set them up so the drive contact was centered and not too deep and let em eat. At least they lasted.


I agree with Jay. The deeper the gear the more prone to noise.
I got a se t of 4.56's that you can hear over the headers. I am the second owner, and both of us had them professionally set up but at different shops. granted when I got them the pattern was set so curing the singing was not an option. Don't get hot and work fine for what they are used for.
Think that you are noisy - listen to some of teh 18 wheelers go down the highway.