4 wheel drive

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Nov 3, 2015 | 08:36 AM

g tinsley

Thread Starter

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Joined: Jul 2004

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4 wheel drive

I have 2005 f350 will not shift on the fly. with a vacumn pump it will hold vacumn at both hubs but will not lock up. the seals should be good .help appreciated.

Nov 3, 2015 | 08:53 AM

87crewdually

Lead Driver

Joined: Dec 2006

Posts: 6,496

Likes: 94

From: So. Jersey

There's 2 parts to the system. The vacuum locking hubs which you are aware and the electronic shift motor side.
Can you hear the motor shifting the transfercase?

Nov 3, 2015 | 10:56 AM

WatsonR

Lead Driver

Joined: May 2014

Posts: 6,545

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From: Virginia Beach VA

you can turn the key on without starting the truck. After the fuel pump shuts off, switch to 4 high and listen for the motor.

Nov 3, 2015 | 01:17 PM

bobv60

Fleet Mechanic

Joined: May 2011

Posts: 1,866

Likes: 84

From: Rainier OR

Mine wasnt working right. Cheeked for vacuum leaks and everything was good but would have a large leak when 4WD was selected (hvac blend doors would move to defrost ). Replaced the hub control valve and works good now.

Nov 3, 2015 | 02:15 PM

TeachNlive4ever

Cargo Master

Joined: May 2015

Posts: 2,350

Likes: 7

From: Garland, Tx

Quote:

Originally Posted by bobv60

Hub control valve, is that the pump on the left side behind the battery?
My 06 didn't work and I just completed both sides, u-joints and seals and now my on the fky works, yea me.

Nov 3, 2015 | 02:16 PM

MisterCMK

Fleet Owner

Joined: Mar 2003

Posts: 24,724

Likes: 74

From: Blue Hill Township

Like others have said, check the solenoid on the fender. I found mine was cracked.

Nov 3, 2015 | 03:42 PM

Rusty Axlerod

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Joined: Feb 2011

Posts: 8,241

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From: L.A. (Lower Alabama)

is there a quick way to check it with a meter or power? I'm having issues also and have done 0 research.

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Nov 3, 2015 | 05:14 PM

Rusty Axlerod

Lead Driver

Joined: Feb 2011

Posts: 8,241

Likes: 155

From: L.A. (Lower Alabama)

I'll start another thread so I don't

Nov 3, 2015 | 06:40 PM

#10

g tinsley

Thread Starter

Junior User

Joined: Jul 2004

Posts: 85

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4wheel drive

Quote:

Originally Posted by TeachNlive4ever

here's your research and get back to us. As someone said, turn your A/C on, then swith to 4hi. Does the air then start coming out of the defrost vents?

The actual comes out the vents like it should it does not have a vacumn leak

Nov 4, 2015 | 03:51 AM

#11

Yahiko

Fleet Owner

Joined: Apr 2012

Posts: 27,307

Likes: 549

From: Spanaway

Ok I posted the 4WD PDFs in the thread Rusty had before I had seen this one.
You can have a look at the info here >>> https://www.ford-trucks.com/forums/1...l#post15765192

Sean

6.0L Tech Folder