A complete and thorough explanation on how four wheel drive (4WD) 4x4 systems work. This video will look into depth on how part time and full time four wheel drive systems work, operate, what to expect and when to use it. It will cover in depth the following: 0:00 - Intro to Four Wheel Driving 0:39 - Drivetrain Fundamentals 1:58 - Open Differentials 2:22 - Transfer Case Function 2:44 - Part Time 4WD 3:01 - Full Time 4WD and Centre Differential Lock 3:18 - 2H (Two Wheel Drive - High Range) Explained 4:01 - 2H and Open Differential Problem Demonstrated 4:16 - Rear Differential Lock 5:15 - 2H Off Road Demonstration 5:27 - 4H (Four Wheel Drive - High Range) Explained 5:53 - Wind-Up Phenomenon Explained 7:00 - Centre Differential Function in Full Time 4WD 8:19 - The Diagonal Effect Explained and Demonstrated 9:08 - 4H Off Road Demonstration 9:18 - 4L (Four Wheel Drive - Low Range) Explained 10:54 - 4L Advantages 11:24 - Crawl Ratio Explained 12:37 - 4L Off Road Demonstration 12:52 - Free Wheeling and Permanent Locked Hubs Explained 14:03 - Overcoming the Open Differential Problem 14:21 - True 4WD (Locked Differentials) Explained 14:45 - Limited Slip Differentials (LSD) Explained 15:19 - Brake Traction Control (BTC) Explained 16:08 - BTC Demonstration 16:17 - Conclusion *Please note: In this video I have incorrectly mentioned that Torque is distributed/split based on wheel resistance. In reality, in an open differential Torque is split evenly 50%-50% to each axle regardless of wheel resistance. However, Power is split based on wheel resistance in an open differential, not Torque. Power = Torque x Angular Velocity. Therefore, in an open differential, if a wheel is in the air and freely spinning, the other wheel which isn't rotating isn't transmitting any Power (as Angular Velocity = 0, but Torque is still present). Please refer to Part 2 video 'Open and Locked Differentials Power and Torque Transfer': https://www.youtube.com/watch?v=zrNYVp227Zk Thank you for watching! Please subscribe: https://www.youtube.com/channel/UCzKwfJaEpdGOb1hCozkLQKQ Was this video helpful? Send a super 'Thanks❤️', it would be much appreciated! #4wd #4wd247 #4wdadventure #4x4