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Home >> Ford >> 2004 >> Excursion 6.8 S, 4WD >> Repair and Diagnosis (Single Page) >> Drivelines & Axles >> Locking Hubs >> Four-Wheel Drive Systems - Excursion & F250-F550 Super Duty >> Diagnosis And Testing >> Four-Wheel Drive Systems - Mechanical Shift >> Principles of Operation >> 4-Wheel Drive - 4X4 LOW

4-Wheel Drive - 4X4 LOW

4X4 LOW allows for maximum pulling capacity. Shifting into 4X4 LOW causes the range sleeve to move rearward and engage the planetary gear to achieve gear reduction. The result is that the output shaft now turns more slowly than the input shaft. This action increases the pulling capacity available to the wheels.