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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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Old 09-27-2011, 03:20 PM
BARRY HAMPTON BARRY HAMPTON is offline
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2005 F150 4x4 transfer case problem

My transfer case will only pull vacuum to the hubs when floor shifter is in between 4 low and 4 high. as soon as the dash light comes on for low or high it looses vacuum. Is there a switch that tells it to pull vacuum? Does anyone out there have a good breakdown of the transfer case?
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Old 09-27-2011, 03:58 PM
Jake_f16 Jake_f16 is offline
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I don't think I understand what you are saying....When you put your truck in 4 wheel drive the hubs should loose vacuum to allow the hubs to lock into place. When you put it back in 2 wheel drive the hubs should have vacuum to pull the hubs back and disangauge the hubs. In 2 wheel drive your hubs will always have vacuum.
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Old 09-28-2011, 06:20 AM
BARRY HAMPTON BARRY HAMPTON is offline
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f150 4x4 transfer case problem

My understanding is that vacuum engages the hubs. I could be wroong, hopefully someone out there has gone through this before.
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Old 09-28-2011, 08:04 AM
Jake_f16 Jake_f16 is offline
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Barry

The vacuum keeps your hubs disengaged until you put the truck in 4 wheeldrive then the vacuum releases the hubs and allows them to engage.
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Old 09-28-2011, 08:12 AM
BARRY HAMPTON BARRY HAMPTON is offline
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So in theory with the engine off and vacuum depleated if I jack the front tires off the ground the huds sould be locked in?
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Old 09-28-2011, 08:13 AM
BARRY HAMPTON BARRY HAMPTON is offline
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That would mean in a pinch I could pull the vacuum lines off the hubs and I would have 4 wheel drive?
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Old 10-07-2011, 06:32 AM
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Short answer= yes.

Here's the best trouble shooting info for the 4x4 vacuum system;

http://www.ford-trucks.com/forums/83...then-some.html
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Old 10-07-2011, 06:32 AM
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