1964 Ford 4000 Diesel Farm Tractor

Alow me to introduce myself. I grew up in the small farming community of Sycamore in North Florida. I can name every tractor used on the farm and my learning to drive them beginning in the age of five. Having said that, I've recently bought a long-not used and in need of restoration 1964 Ford 4000, four cylinder, four forward speed w/reverse Diesel farm tractor. This tractor has what appears to be a gear range selector lever on the left side of the transmission/gear train housing, just to the rear of the engine, and just under and to the rear of the battery box. In all the pictures I've seen and the technical/maintenance/owner's manuals I've researched, none show, indicate or have any information regarding what this lever does. At this time, the tractor is not running. I'm asking for any information, and sources, to identify what this lever activates and what its function may be. It is moveable in what appears to be two distinct positions. It feels/sounds like internal gears are meshing. THANKS for any input to "learn" me what this does and its, if any uniqueness.
 
Look up Sherman auxiliary transmissions. It sounds like you have one of those. They
came as either a direct and underdrive, direct and overdrive, underdrive-direct-
overdrive, or a reversing transmission. On the 3 speed the handle also moves in or
out along with back and forth. The reversing transmission gives you the same speed
in both directions without having to change the main shifter. They also have a
neutral in the middle so the tractor won't move at all but can roll down a hill if
the brakes are not set.
 
The over/direct and under/direct Sherman's weren't used after the early '50s, although one could have been retrofitted to this tractor. If it was factory, or added by the dealer when new, it would be a combo (over/direct/under drive) or reverser. The combo is far more likely. The reversers were used almost exclusively on dedicated loader tractors and forklifts.
The combo had a distinct shifter handle shape. If you can post a picture here (or scroll down to the Ford forum), onevof us can identify it for you.
 

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