Shift on the fly 4 wheel drive - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 07-25-2006, 07:15 AM   #1 (permalink)
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Shift on the fly 4 wheel drive

I have been looking on the site for about 3 hours and I cannot find any threads about the 4 wheel drive system. I have an 02 350 with electronic shift on the fly 4 wheel drive and it does not work with the hubs in auto, but does work when the hubs are in manual. Anyone have this problem or read any threads about this problem. Thanks in advance.
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Old 07-25-2006, 07:32 AM   #2 (permalink)
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Re: Shift on the fly 4 wheel drive

I'm still learning about them too, but from what I do know...you have a vaccum leak somewhere. When the hubs are in "auto" they are activated by vaccum pressure. I think there are some o-rings that seal the hub that are known to leak sometimes. Or it may be the vaccum lines them selves leaking.

I'm sure some one else will be of more help, but this should give you a start...Welcome to TDS!
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Old 07-25-2006, 07:40 AM   #3 (permalink)
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Re: Shift on the fly 4 wheel drive

Does your air conditioning/heat go to the defrost position? If so, a vacuum leak would be the first thing to check for.

Could be the hoses leading to the hubs.
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Old 07-25-2006, 04:32 PM   #4 (permalink)
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Re: Shift on the fly 4 wheel drive

Check your vaccum lines that are located beside your brake line on the front of your truck and see if they are cracked where they attach at the knuckle on the inside of your wheel well. Mine were split and cracked there.

Good Luck
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Old 07-25-2006, 04:39 PM   #5 (permalink)
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Re: Shift on the fly 4 wheel drive

definitely check your hoses going to the hubs......i replaced mine with braided stainless lines for the hell of it 2 years ago and i couldnt believe how bad of shape mine were in after ony 25k miles
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Old 07-25-2006, 04:53 PM   #6 (permalink)
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Re: Shift on the fly 4 wheel drive

Auto lockers suck... if you think you will be using your 4wheel drive that day lock them in and dont worry about it. if your not leave them unlocked. easy as that. I love my WARN lockers.
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Old 07-25-2006, 11:49 PM   #7 (permalink)
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Re: Shift on the fly 4 wheel drive

Just to make sure I am using the manual function on mine right . . . I turn them in to lock position and leave the Knob on the dash in 2wd until I need it right? Still waiting on my braided lines to show up. The heavy part (powerslots) got here right away. If the lines do not fix the problem, I dont know if I can get it to the dealership to get the hub seals fixed before Antelope Hunting at the end of August. How hard is a hub seal to fix? How long to fix it? Special knowledge and tools? Starting to think I should have had my buddy that did the brake job pull the front hubs apart to check the seals while he was in there.
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Old 07-26-2006, 12:07 AM   #8 (permalink)
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Re: Shift on the fly 4 wheel drive

Thanks for the help, I will check the lines tonight.
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Old 07-26-2006, 03:27 AM   #9 (permalink)
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Re: Shift on the fly 4 wheel drive

Just remember that it is common for the hubs to seize in the locked position if left that way for an extended period of time. Almost all problems you'll find with the vacuum actuated hubs can be attributed to bad O ring seals. One thing you can try is to pull the hubs (just release the spring ring holding them in place and tap on them side to side with a rubber mallet to work them loose). Once you have the hub off inspect the external O ring on the hub. Soak the hub with WD40 or ATF and let it soak overnight. Flush it out with solvent, and re-spray lightly with WD40 before re-installing. Make sure you clean the O ring and it's sealing surface well. A coating of silicone grease or O ring lubricant on the surface is also a good idea before installing. Doing the above might solve your entire problem. Make sure you inspect that external seal well and replace the O ring if you need to. An O ring of comperable size will do just fine. No real need to run to Ford because they will only sell you a kit that includes that ring and the other seals to do a complete job. Just getting everything freed up and lubricated might solve the whole mess.

I service my hubs in the above manner at every oil change and everything has always worked just fine.

Larry [img]/ubbthreads/images/graemlins/cool.gif[/img]
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Old 07-26-2006, 06:01 AM   #10 (permalink)
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Re: Shift on the fly 4 wheel drive

Before you start tearing things apart, you might want to check that the vacuum relay on the right hand fender is plugged in.
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Old 07-27-2006, 12:54 AM   #11 (permalink)
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Re: Shift on the fly 4 wheel drive

ford made full manual hubs an option on all their trucks since the year after they introduced their hurry up and wait system.

folks that DEPEND on 4 wd working pretty much all convert to full manual hubs.

Myself, I spin my hubs to lock in late november, and spin to free in mid May. spend some time in 4wd, but spend a lot more time just spinning the front driveline in 2wd.

It doesn't hurt anything.
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Old 07-27-2006, 01:14 AM   #12 (permalink)
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Re: Shift on the fly 4 wheel drive

Regarding the vacume relay. Is there a map to it in the owners manual? Maybe some directions as to what it looks like? Also, lets face it guys the ESOF system is better than the pre '99 auto hub option. Quirky, but not inherently weak like the old system. When my dad called me about my old '97, I said I'd test drive it only after I knew it had the Ford Manuals. Braided lines are in. Gonna install them this weekend, but I have a strange feeling they are not the problem since I still have air out of the vents. In this dry climate the seals seem like a big probability.
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Old 07-27-2006, 07:40 AM   #13 (permalink)
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Re: Shift on the fly 4 wheel drive

[ QUOTE ]
Auto lockers suck... if you think you will be using your 4wheel drive that day lock them in and dont worry about it. if your not leave them unlocked. easy as that. I love my WARN lockers.

[/ QUOTE ]

With is system there could be a leak at the seal on the axle. If you don't fix it can leak water into the hub assembly and trash the bearings,etc.
He has to find out were the leak is. Sometimes it's the Vacum Solenoid on the fender.

There's lot's of post's out there on this.
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Old 07-28-2006, 03:37 PM   #14 (permalink)
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Re: Shift on the fly 4 wheel drive

ive heard the 4wd switches on the dash are bad about goin out.
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Old 07-28-2006, 03:40 PM   #15 (permalink)
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Re: Shift on the fly 4 wheel drive

im in the same boat with my 4wd except my 4x4 doesn't light up on my dash
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