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normally the gears in your gear box are cut on a helix (helical gears) but to make things easier just imagine they are cut on an angle, the stright cut gear has the teeth cut straight on the cut face, giving much more strength and less power loss. noise is the trade off, helical gears are quiet where straight cut gears are noisy, you may have seen wrx's getting around with straight cut gears, or your reverse gear is another example of a straight cut gear.
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