Alvis Speed 25, transmission, "single plate clutch, separate 4-speed gearbox all-silent and all-syncromesh, centre change lever, open tubular propellor shaft with metal joints , spiral bevel fully floating back axle"; Alvis Speed 25, class, Full-size car

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Alvis Speed 25 is a full size car with a transmission system made of a single plate clutch, separate 4-speed gearbox all-silent and all-syncromesh, centre change lever, open tubular propellor shaft with metal joints and spiral bevel fully floating back axle.