What are the empty spaces on the diff lock console?
Some countries (not USA or Canada) got Syncros with locking front differentials. These models used the leftmost knob position and light position for the front diff operation just like the more familiar rear diff lock. Differentials without the locking unit will not except the internal locking parts without machining. The locking parts are essentially the same as the one used in the rear differential. Some other Syncros were built without the automatically engaging viscous coupling. These have a simple mechanical coupling at the front end of the transmission, which is operated by a knob in the center position of the diff lock console.
