Found a nice video to explain Front, Rear, Center Diff locks here:
https://www.instagram.com/reel/DVy7kTHjNzC/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA==
*Technically it's an AWD 'cos a 4WD has transfer case + 4Lo , but it does explain why the power goes to UNSTUCK wheels when you are stuck 🙏
https://www.instagram.com/reel/DVy7kTHjNzC/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA==