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How do auto-locking hubs work?

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Sean

04-29-2000 03:38:31




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How do auto-locking hubs on modern 4x4 hubs work? My truck still has the get-out-and-turn-with-wrench type, but most of the newer trucks I've looked at seem to have the auto-lockers. I've also heard that the auto type only engages in forward gears (sounds pretty useless to me). The three mechanisms I can think of are ratchet (forward only), centrifical clutch (seems like there could be a lot of spin before they engage), or transmission-activated clutch (sounds expensive to build). Am I close?

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clooney

04-29-2000 05:21:06




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 Re: how do auto-locking hubs work? in reply to Sean, 04-29-2000 03:38:31  
Sean, the modern G.M type uses a sliding sleeve (sort of like a syncronizer ring in a manual trans) that is engaged by a cam that is turned by a spring type brake band. They work by a differential in rotational speed between the inner (drive axle) and the spindle. They work in either the forward or reverse direction,once they are engaged, as long as the ft. axle is turning. Once the front drive shaft is no longer powered (quits turning) the ft. hubs try to release (it usually takes backing the vehicle up a few feet to make sure they are released completly. Note: this is a very simple explanation, there are more parts in those hubs to help apply rates and retain engagement. Also the only hubs I am familiar with are G.M. This also does not apply to independent ft. axles that have a frame mounted differential, those are vacuum or electrically controlled.

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