Gear ratios
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The gear ratio can be calculated by dividing the number of teeth on the driven gear, by the number of teeth on the driver gear.
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Compound gear trains
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Compound gear trains have two or more pairs of gears in mesh, so that they rotate together.
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Gear selection
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In manual transmissions, an interlock mechanism prevents the engagement of more than one gear at any one time and a detent mechanism holds the gear, in detention, in the selected position.
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Bearings
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In a manual transmission, the gears and shafts are supported on bearings or bearing surfaces, which allow for rotation and also maintain the alignment of the components.
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Oil seals & gaskets
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Oil seals and gaskets are fitted to manual transmissions to prevent oil leakage and the ingress of dirt and moisture.
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