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Auto locking hubs don't engage?

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Old Apr 1, 2014 | 09:09 AM
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Auto locking hubs don't engage?

And the vacuum pump was replaced. Any ideas?
 
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Old Apr 1, 2014 | 09:09 AM
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Transfer case is also fine
 
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Old Apr 1, 2014 | 09:33 AM
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Rusted or cracked vacuum lines, bad relay, hubs need serviced, any number of things.
 
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Old Apr 1, 2014 | 11:43 AM
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Originally Posted by RRTREE
And the vacuum pump was replaced. Any ideas?
Best to do a search in here and you can read about it all night.
 
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Old Apr 1, 2014 | 12:01 PM
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I just read on the other forum for the pickups and they said to check for vacuum leak if your ac switches from your dash to your defrost when you turn on your four wheel drive you have a vacuum leak and mine is doing that. So hopefully a simple hose problems
 
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Old Apr 1, 2014 | 12:16 PM
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Search here and in the Superduty section. Get back in 2 days after you read it all.
 
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Old Apr 1, 2014 | 10:35 PM
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Vacuum pump good. Lined good auto hubs are stuck! I'm just putting on warn hubs and forgetting all that vacuum stuff.
 
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Old Apr 1, 2014 | 11:15 PM
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Originally Posted by RRTREE
Vacuum pump good. Lined good auto hubs are stuck! I'm just putting on warn hubs and forgetting all that vacuum stuff.
They don't have vacuum either.
 
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