Congratulations, buddy. This is undoubtedly the best RC tractor I've ever seen. It's very disappointing that manufacturers don't make 4x4 models. So, speaking of which: how did you manage to figure out the exact transmission ratio for the front and rear axle wheels so that both transmit the exact rotations to the wheels, considering the front ones are smaller than the rear ones?
After I created the front and rear axles, I calculated the rotation speed of the bevel shafts and, through the gearbox, obtained a match between the two gearboxes