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The majority of late model Broncos (probably 75% back in 88' & closer to 90% by 96') came with automatic hubs & transfer cases. Hubs come in two varities, manual & auto. Manual hubs are exactly that, manual. In order to lock them you have to manually turn the dial on each hub to lock or unlock it. Automatic hubs engage automatically thru centrifugal motion. As the wheel rotates the hub spins into the locked position. Auto hubs have the "advantage" of not requiring you to get out of the cab to lock them but this is outweighed by the DISadvantage of having them unlock themselves whenever the wheels change direction, so if you back up a few feet they'll *automatically* unlock themselvs. This is not always advantageous when you're stuck in the mud or deep snow and it makes rocking yourself out of a stuck pretty much impossible. Manual hubs are much more robust and rarely ever fail, automatic hubs die with obscene regularity. In prolonged poor weather, such as winter in New England, it's no big deal to just lock your hubs in October & leave them locked until March, but the marketing agencies for SUV mfg's convinced all the soccer mom's that auto hubs were the way to go because they wouldn't have to he hopping in & out of that big ole' truck all the time to lock & unlock the hubs. Nothing but propaganda to sell a more expensive option of course but a lot of people fell for it.what does the manual hubs mean? and how is locking the manual transfer case done?