Abstract: A shift interlock for a multi-speed transmission controlled by a speed lever and a directional lever is disclosed which prevents inadvertent operation of the directional control feature while the transmission is in the high gear ratios. The interlock is comprised of a pair of lock pins disposed between a first and second shift rod and having a length longer than the distance separating the shift rods. Each shift rod defines a plurality of grooves thereabout to receive the lock pins. One rod is movable in a first or a second direction to urge at least one of the lock pins into one of the annular grooves of the second rod to prevent reciprocation of the second shift rod. The second shift rod is reciprocable only with the first shift rod in the neutral position.