* 4 Auto (or Auto 4WD): This mode automatically engages 4-wheel drive when the system detects wheel slippage. It's designed for situations with low traction, like snow, ice, or mud. The system constantly monitors wheel speed and engages 4WD only when needed. It's generally best for on-road use in slippery conditions. It *does not* lock the front and rear axles together at a 1:1 ratio.
* 4 Hi (or 4 High): This mode provides full-time 4-wheel drive. It locks the front and rear axles together, sending power to all four wheels constantly. This is better for off-road situations requiring maximum traction, but should generally be avoided on dry pavement, as it can cause binding and reduced handling.
In short: Use 4 Auto for slippery on-road conditions. Use 4 Hi for off-road situations needing maximum traction. Avoid using 4Hi on dry pavement.
