4x4 "SOTF" and Manual Hub Position - Ford Powerstroke Diesel Forum
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Old 06-20-2013, 07:57 PM
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Question 4x4 "SOTF" and Manual Hub Position

Hi all! As the title suggests, I have shift-on-the-fly (2WD / 4H / 4L), and manual hubs. From what I've read elsewhere, that is stock for my truck. The markings on the manual locks are gone, and I don't want to ruin anything.

I assume "free" is normal 2WD mode, but because the markings are gone, I'm not clear on which direction to turn them for "free" / 2WD, and do I need to manually lock those in for 4WD, while also using the "sotf" switch inside the cab?

Description of my rig is in the signature. Much obliged!
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Old 06-20-2013, 09:00 PM
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Lefty loosey (unlocked/auto) righty tighty (locked). If they operate correctly, you just need to flick the switch on the dash.
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Old 06-20-2013, 09:01 PM
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the system is called ESOF or electronic switch on the fly.
their is vacuum lines that run to the hubs that engage them.
check these lines they often get dry rotted and wont hold pressure to engage the hubs.

and yes you can lock them at the hubs.
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Old 06-21-2013, 12:19 AM
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when it pops its locked in 4wd, you will feel it when turn the hub, one of mine are worn and the other isn"t and that's how i can tell

free/auto mode dosen't have the pop when you turn it. takes some resistance to unlock the hubs


you can also turn the wheel and reach around the tire and try to turn the axle shaft by hand. if it turns your hubs are unlocked
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Old 06-21-2013, 05:10 AM
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Thanks for the help, hope to return the favor! When you say flick the switch on dash, do you mean the ESOF dial, or the toggle I have next to it that doesn't seem to operate anything? Could that be a stock switch as well?
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Originally Posted by Zaairman View Post
Lefty loosey (unlocked/auto) righty tighty (locked). If they operate correctly, you just need to flick the switch on the dash.
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Old 06-21-2013, 10:30 AM
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Originally Posted by RafterQ View Post
Thanks for the help, hope to return the favor! When you say flick the switch on dash, do you mean the ESOF dial, or the toggle I have next to it that doesn't seem to operate anything? Could that be a stock switch as well?
The ESOF dial only.

We would have to see a picture of the toggle switch to tell if it is factory or not.
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Old 06-21-2013, 04:09 PM
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Sorry, shoulda thought of that Hey, Greg...we moved back out to KC from Santa Rosa in '97. Have things changed much? I miss the In 'N Out Burger in Rhonert Park badly, and it almost kept us from moving..heh heh.
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Old 06-21-2013, 04:14 PM
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Togggle is non OEM

fog lights ?
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Old 06-21-2013, 04:47 PM
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Fog lights work by pulling out on the OEM headlights dial...hmmm. Of course the feller I bought it from, doesn't know what it does (I'm the 7th owner). He didn't know what the loose wire hanging down under the dash is for, or why the turbo boost gauge isn't getting power, which is fine, if he told me the truth. If he didn't, how much more helpful would it be to me to know the real scoop? Not like, at that price I wouldn't have bought it anyway, I reckon.
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