All I ever wanted as a child was a tractor - my parents didn't oblige. When I was in my thirties I bought a 1968 David Brown 770, which I finally sold in 2014 when I sold my French house. This inspired me to recreate the transmission workings - approximately I must add. This model is in the early stages, so no brakes or engine parts yet, more as it progresses. The gearbox had 12 forward gears and four reverses (4 ratios operating on 3 gears and one reverse) and was controlled by two levers. It did not have the proportional epicyclic torque splitter of this model (just wanted to see if I could model one) and had only a single speed PTO - this model has a two speed epicyclic PTO drive. It did have the diff lock however. All the parts including the gear levers work correctly and are driven by empties and transformation constraints. Enjoy if you like tractors!
