Abstract: The present invention, in certain embodiments, discloses a vehicle transmission system having a typical transmission with associated transmission shifting apparatus that includes gears and a manually-operated gear selection apparatus. Such gear selection apparatus includes a transmission selector shaft interconnected between a shifting handle or rod in the vehicle's cab and internal gearing within the transmission. Manual manipulation of the cab-mounted handle or rod moves the transmission selector shaft whose movement in turn results in a gear change. The transmission includes a locking system according to the present invention with a swing arm secured to the transmission selector shaft with an upper surface having a window therethrough or stop thereon.