Manual hubs?
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Fleet Mechanic
Joined: Dec 2012
Posts: 1,257
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From: Scottsdale, AZ
Manual hubs?
Sorry I know nothing about four-wheel-drive. Are these manual hubs? When I turn the switch in the 4 x 4 the drive shaft turns but it doesn't feel like it's in four-wheel-drive. The vacuum lines on the hubs were broken and corroded so I replace those, but still does not feel like it's in four-wheel-drive. Do I need to lock the hubs? Did this truck come with automatic locking hubs?
More Turbo
Joined: Feb 2004
Posts: 727
Likes: 2
From: Seaside NJ
The hubs have 2 positions, auto and lock, in auto position they are actuated by the vac system, in lock its exactly that, locked. They might be stuck and not working off the vac system, try turning them to the lock postiton and try your 4wd, roll forward slowly and turn the steering back and forth, steering should feel tighter than normal if 4x4 is engaged
I would venture a guess that since the vac lines were broken and leaking, that the PO probably didnt use the 4x4 much, good chance the hubs are stuck
I would venture a guess that since the vac lines were broken and leaking, that the PO probably didnt use the 4x4 much, good chance the hubs are stuck
Moderator
Joined: Jul 2010
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From: Media PA
That, or some other brand or you could read how to service the stockers in the Tech Folders at the top of this page.
Post Fiend
Joined: Feb 2011
Posts: 26,410
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From: Ft. Lauderdale, FL
If you have the time, since it doesn't snow in this country anymore... I would try repairing (servicing) the one you have now.
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Fleet Mechanic
Joined: Dec 2012
Posts: 1,257
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From: Scottsdale, AZ
I see, so why doesn't the AUTO position work when I flip the 4x4 switch? I put new vacuum hoses on the hubs
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Lead Driver
Joined: Apr 2011
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From: Northern California
Once you have have established that vacuum is actually making it to the hub when you flip the switch then the issue can be narrowed down to a leaking or sticky hub.
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Posting Guru
Joined: Aug 2012
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From: Central Tx.
A lot of the time the leak/problem is at the Tee fitting just out side the Vac bottle on the fender. It can be the bottle leaking itself as well.
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Joined: Jul 2010
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From: Media PA
The vacuum solenoid on the passenger fender is also know to fail sometimes on these ESOF systems.
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CoachGJ
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Jun 20, 2012 08:25 PM