Originally Posted By: TallPaul
Originally Posted By: exranger06
Yes, that's all true. But that has nothing to do with locking hubs. My Ranger has "true 4wd" and it doesn't have (un)lockable hubs.
Oh, I know. To get locking hubs I think you have to get something from the 1970s.
Actually Ford offered manual locking hubs as a factory option on the Ranger through 1997. The last Ford to have manual locking hubs was the Super Duty, and that's very recent. They may still be available with them, not sure.
The hubs simply control engagement of the front axle and were really a fuel economy feature. Ford introduced auto hubs in the 1980s, and experimented with a number of designs in the 1990s, most of which were vacuum operated. The Ranger used a vacuum hub system in '98-'99, but it was unreliable, so Ford just ditched it and went to a live axle setup where the front differential is always engaged, whether or not the truck is in 4WD. You get worse fuel economy, but its simpler and removes a failure point from the chain. There are aftermarket manual hubs available for '98-'99 Rangers, as well as a way to bypass the vacuum hubs so they are always engaged.
My Explorer actually had a vacuum disconnect on the axle itself (not at the hubs). I don't know exactly how it worked, but it involved a lot of clunking noises. It's the "box" on the axle tube...