3:73's -- manufacturers will tell you that for some reason that ratio is "noisy". I've talked with Randy's Ring and Pinion (they're local for me) about this and that's what they told me. The Eaton rep told me the very same thing.
I frankly wonder how much of this is the transmission vs the rear end... the tranny in my '32 Ford is noisy... but I just chalk that up to the fact that the idiots at SAR probably charged me for a brand new one and installed a used one -- or that they ran it dry for a few days.... I'll replace it this winter.
The '32 runs straight cut quick change gears -- and they're noisy... so I might switch to helical cut versions when I do the tranny. s
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