The knob or dial that is turned on a manual locking hub engages the front output shafts or axles to turn the wheels. Disengaging lockout hubs allows the front wheels to turn freely. Having them turn freely saves on fuel / gas when 4x4 is not needed. Manufacturers of lockout manual hubs for your front drivetrain are Warn, Milemarker and Superwinch.
Automatic 4wd drive hubs allow you to shift in and out of 4wd while the vehicle is moving. Inertia rings and springs are used by some manufacturers. Some newer vehicles allow for manual operation of the front hubs in case of a failure of the automatic system.
Part Time 4WD - Refers to a four wheel drive system that operates on-demand and drives all four wheels by locking front and rear axles together via a hand shift lever on the floor. It usually includes two speed ranges (Hi and Lo). Part-time 4WD systems must be operated in 2WD mode on dry pavement, as they're designed to only be used in specific situations when extra traction is required.
Full Time 4WD - Full time four wheel drive is a system that powers all four wheels at all times. Full Time four wheel drive system can be operated continuously on all surfaces. A full-time four wheel drive system may include the option of part-time operation and may or may not have Hi and Lo speed ranges.
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Automotive Accessories Connection.
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