ESOF question
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Joined: Jul 2003
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From: Newport, WA
ESOF question
Yes, unfortunately the truck I just bought is a dang ESOF truck. If that's its only fault I suppose I can live with it. However, I have a couple of questions for the gurus out there, being new to this system.
1. I have locking hubs which I understand are to use just in case the ESOF fails, but how do I tell which position is lock and which is free?
2. I had one tire off the ground today trying to pull the rotors (note, a 1 ton floor jack is NOT enough for lifting the front end of these trucks! Just got back with a new 6 ton bottle jack, that oughta do the trick. No the truck did not fall and nothing bad happened, but trying to lift even one corner with that little jack took A LOT of gruntwork) While I had the one tire off I grabbed the wheel studs and spun the rotor, because I always do stuff like that and I'm not quite sure why. Regardless, when I did I noticed the front driveshaft turning also. I tried flipping the manual lock out to the other position, same story. Is this normal? Seems to me it wouldn't be normal for the whole front end to be turning all the time with the switch in 4x2- have I got a problem somewhere?
1. I have locking hubs which I understand are to use just in case the ESOF fails, but how do I tell which position is lock and which is free?
2. I had one tire off the ground today trying to pull the rotors (note, a 1 ton floor jack is NOT enough for lifting the front end of these trucks! Just got back with a new 6 ton bottle jack, that oughta do the trick. No the truck did not fall and nothing bad happened, but trying to lift even one corner with that little jack took A LOT of gruntwork) While I had the one tire off I grabbed the wheel studs and spun the rotor, because I always do stuff like that and I'm not quite sure why. Regardless, when I did I noticed the front driveshaft turning also. I tried flipping the manual lock out to the other position, same story. Is this normal? Seems to me it wouldn't be normal for the whole front end to be turning all the time with the switch in 4x2- have I got a problem somewhere?
Senior User
Joined: Mar 2007
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From: Issaquah, WA
As for the hubs; full clockwise is locked. They only rotate about 30-45 deg between locked and unlocked. Not sure if there is enough friciton in the system to turn the drive shaft with the wheel unlocked, probably is. You should be able to hold the drive shaft from moving while spinning the unlocked wheel though.
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Joined: Oct 2004
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If you have ESOF, you don't have a "free" position. You have "Auto" and "Lock". Your "Auto" will eventually fail due to a vacuum leak from any where between the pump and the hubs. Do yourself a favor and get some WARN Premium manual hubs and block off the vacuum lines then you'll never have a problem.
Hope this helps.
Hope this helps.
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Joined: Oct 2004
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Ok, I just read the 1st post again. I need to do that more often. If I remember correctly, counter-clockwise is "Auto". Regardless, lift both sides of the front. Put both hubs in the same place and spin a front tire. Then turn the hubs all the way to the same place and spin a tire. That should get you what you're looking for. Unless one of your POS OE hubs are stuck. But, if that's the case, it will be really hard to turn. Sometimes enough for you to resort to pliers, channel-locks or vise-grips then causing you to break the POS plastic.
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Joined: Jul 2003
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From: Newport, WA
Originally Posted by c00nhunterjoe
brain fart- what is esof?
and your shaft shouldnt spin with the hubs unlocked, the *** is bad, common problem on them when they are left unused for long periods of time
and your shaft shouldnt spin with the hubs unlocked, the *** is bad, common problem on them when they are left unused for long periods of time
ESOF= electronic shift on the fly.I was hoping today to get the front end up and pull the rotors, but like I said my 1 ton floor jack wasn't cutting it. I bought a 6 ton bottle jack today that should do the trick- I'll try some of the suggestions posted and if I can't get things to work like they should I'll buy Warn hubs and be done with the
vacuum setup. What can a guy use to plug the vacuum lines?
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Joined: Jul 2003
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From: Newport, WA
Got the front end up today, turns out both hubs were in Lock- twisted the **** and the problem went away. However, now I'm curious if the PO had them in lock because the vacuum system has failed, I'll have to test out I suppose.
Posting Guru
Joined: Nov 2006
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From: Herndon KY
easy way to test put your air system on vent feel the air blowing with your hand then engage 4 wd and after 15 seconds or so you have automatically turned the defrost. by the way it is not ESOF it is EDOF (electronic defrost on the fly)
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