This is a red 4WD tractor that I built based on another much smaller and better 4WD tractor I have seen here on Moc Pages. It has 4 driving wheels, all driven by a very simple cog system. There is also a PTO that drives the front rotary cultivator driven by the cog system that turnsa the wheels.
If you can see through the bluriness you should be able to see the cab detail.
This is the simple 4WD system that drives all four wheels and both front and back PTOs. There is only 6 cogs in the simple 4WD system.