906UP
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This is due to the gear mis-match front to rear, the front diff ring gear has a slightly different gear ratio, by 1 tooth. I've just about eliminated it by running the front tires a few psi higher than the rears, something like 16/12 psi, also run Redline Shockproof in the front, I hardly notice it now. FYI, I have 30" Terrabites all the way around........It has an irritating whine with the front engaged.......