Power is sent to the front and rear axles with the centre differential locked, ensuring that a percentage of power is still sent to the forward axles even if a rear wheel is spinning (and vice versa) however the gearing ratio is doubled, increasing torque by more than 2x and reducing speed in each of the gears by the same factor.
This configuration ensures that power is distributed to both front and rear axles through a locked center differential, maintaining traction in either direction. The gearing has been optimized to amplify torque by over 2x while also reducing speed proportionally in each gear.