At least some implementations of a transmission gear shifter include a shifter for a vehicle transmission that includes a first shift member, a retainer, an actuator and a second shift member. The first shift member has a body rotatable about an axis among multiple positions, and the retainer is movable relative to the body between a first position in which the retainer prevents movement of the body and a second position in which the retainer permits movement of the body. The actuator is coupled to the retainer to drive the retainer between the first position and second position. The second shift member is coupled to the retainer for movement with the retainer relative to the body, and arranged to selectively engage and rotate the body.

A rotary selector switch prevents accidental rotation to an undesired position. For example, an automobile moving forward at 55 kph may have a rotary selector switch in electrical communication with its transmission. The disclosed switch prevents accidental rotation that would indicate that a REVERSE gear is desired when it is not. Optionally, on override feature may permit users to overpower an otherwise prevented rotation.

A rotary selector switch prevents accidental rotation to an undesired position. For example, an automobile moving forward at 55 kph may have a rotary selector switch in electrical communication with its transmission. The disclosed switch prevents accidental rotation that would indicate that a REVERSE gear is desired when it is not. Optionally, on override feature may permit users to overpower an otherwise prevented rotation.