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Is it in 4wd or not?

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  #1  
Old 01-19-2018, 07:17 AM
chaser1602
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Is it in 4wd or not?

I have an 04 f350 d 4x4 with the esof. Pass side hub is leaking air, not holding vacuum when the 4wd switch is put in 4wd. I know this because I tested it with a vacuum pump. My hubs have a auto and lock setting. When I turn the hubs to lock is that manually putting the hubs in 4wd ? I tried that and it didn't feel like the truck was in 4wd. And the 4wd switch in the dash was switched to 4wd
 
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Old 01-19-2018, 09:24 AM
seville009
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Yes - if youíve manually locked the hubs and have engaged the 4wd in the cab, then you should have 4wd. Thatís why you have the option to manually lock them, in case the vacuum system dies.
Can test if itís in 4wd by msking a tight turn and feeling if the steering binds up a bit.
 
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Old 01-19-2018, 09:35 AM
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common pproblem on 4H, 4L selector is the selector **** itself.

it develops cracks on the plastic that results in the **** just spinning.

so make sure the indicator light changes correctly as you select. if not, check the plastic ****.
 
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Old 01-19-2018, 10:24 AM
RailDawg
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Until I can find out why I’m not getting vacuum to my hubs I’ve left my auto-locking hubs in lock.

I’ve been told it doesn’t really hurt anything.

When I turn the switch on the dash is when it actually goes into 4wd.
 
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Old 01-19-2018, 10:44 AM
seville009
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Originally Posted by RailDawg View Post
Until I can find out why Iím not getting vacuum to my hubs Iíve left my auto-locking hubs in lock.

Iíve been told it doesnít really hurt anything.

When I turn the switch on the dash is when it actually goes into 4wd.
Wonít hurt anything.....I manually lock my hubs for the whole winter esch year.
 
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Old 01-19-2018, 10:28 PM
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Stop on a dirt road. Floor it. If your rears spin and it takes a few to get moving, you're not in 4H. If you immediately launch forward, you're in 4H.
 
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Old 01-19-2018, 11:51 PM
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With truck NOT running, Lock the hub, then try to turn the shaft, by hand

this will tell you if it’s engaging or not
 
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Old 01-20-2018, 03:13 AM
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Originally Posted by Lawnpro979 View Post
With truck NOT running, Lock the hub, then try to turn the shaft, by hand

this will tell you if itís engaging or not
Thatíll just tell you if the hubs are locked, not if the transfer case has engaged.
 
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Old 01-20-2018, 08:11 AM
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Originally Posted by seville009 View Post
Thatíll just tell you if the hubs are locked, not if the transfer case has engaged.
Ahhhh, ok thanks, tht makes sense....
 
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Old 01-24-2018, 10:46 AM
chaser1602
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Originally Posted by speakerfritz View Post
common pproblem on 4H, 4L selector is the selector **** itself.

it develops cracks on the plastic that results in the **** just spinning.

so make sure the indicator light changes correctly as you select. if not, check the plastic ****.


The **** is fine. it turns the switch. Turns to 4h 4l and off. I can here the motor turning on/off
 
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Old 01-24-2018, 10:50 AM
chaser1602
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Originally Posted by maticuno View Post
Stop on a dirt road. Floor it. If your rears spin and it takes a few to get moving, you're not in 4H. If you immediately launch forward, you're in 4H.
I tried that on snow. Didn't feel like it was in 4wd at all. That's the reason of my original post.
 
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Old 01-24-2018, 11:50 AM
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Put it in 4wd and see if you can turn the front driveshaft by hand. If you can't, jack the front wheels/wheel up and try again, if you still can't it's likely the lock out hub is broken.

If the front driveshaft turns with wheels jacked up it is the transfer case.
 
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Old 01-24-2018, 07:09 PM
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You don't even have to jack it up. Put it in 2wd and lock both hubs then try to turn the front driveshaft by hand it should be locked if not then one of your hubs isn't engaging. Then if both hubs are working unlock the hubs and shift into 4x4 and try to turn the front drive shaft if it turns then the transfer case isn't engaging.
 
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