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Eaton Gears

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The massive Eaton gears are 1 1/4 inches thick (about the size of NP205 transfer-case gears). According to Scoggins, the square-cut teeth are used in 18-wheeler trannies because they stay engaged under intense torque loads better than helical-cut gears. And he also utilizes big-truck sliding clutches instead of smaller, weaker brass synchronizers found in light-truck trannies.

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