Ford Super Duty (1999-2016) :: F250 V10 - 4 Wheel Drive Hubs Are Not Working With The Vacuum
Oct 9, 2015
I recently picked up a '99 F250 Super Duty with the 6.8L V10 for a song.
The 4 wheel drive hubs are not working with the vacuum. If I use the manual lock on the hubs all is well. I ordered the Innova 31703 CarScan OBD2 + OBD1/ABS/SRS Scan Tool. It says it does Trans codes. I am hoping it will cover the 4 wheel drive too.
Maybe related, the heat is always on. Meaning I feel heat at my feet when the temp dial is cold and fan is off. I can't find the heater control valve to check the vacuum line.
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I noticed that my 4WD is only working now when I manually lock the hubs in (they have that options!), and the air blows out the defroster when I shift, so it looks like I have a vacuum leak. Where are the typical leak points on a 2006 F250? What's the best way to confirm a leak (other than just replacing all of the hose)?
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I have a 2013 F250 which has both the Manual and auto locking hub feature. I tried to plow my driveway this morning and after making one pass I put the truck in reverse and could not back up my steep driveway. The truck is showing locked in 4x4 on the dash, the 4x4 control is in high lock but the front wheels will not turn. It has been very cold here lately (-30) and I'm wondering if the vacuum lines for the auto locking hubs have frozen. I have switched the control out of 4x4 and back in several times, and it does lock in again, but as soon as I put the truck into reverse, they unlock again. The hubs are covered with ice and snow right now so I have not yet tried to manually lock them.
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Love my 03 lariat Super Duty, King Ranch. Just found out 4 wheel drive is not working. Checked fuses, next going to look at the vacuum system, make sure its working. New to the Diesels but going to work at it and learn at the same time. 2003 F-250 4x4 ....
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My 2009 F-350 4x4 has a front wheel option of Auto or Lock ; I think I understand the Auto option but under what circumstances would I lock the hubs and is it safe to leave them in the Lock mode when traveling on the highway?
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So one day my 4 wheel drive just stopped working, when I put in 4hi nothing same with low, the light on the dash doesn't even pop up and it doesn't engage. I've done about everything I could think of doing besides replacing the motor for it and the wiring, I hate getting stuck...
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My F350 4x4 won't go into 4 wheel drive unless I get out and take them out of auto and put them in locked position and when I have it in lock mode it seams to work like it's in auto mode, when I put the switch on the dash in 2wd, it seams like it's only driving the back wheels....
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I recently purchased a 2003 F350 FX4 Dually with the 7.3L Diesel. It has locking hubs and electric shift in the cab.
I have had locking hubs before that you had to engage to shift into 4 wheel drive and I have had trucks without locking hubs.
My truck didn't come with a manual, so I am looking for instructions for the proper use of this system.
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2001 F-250 7.3. The auto lock hubs are not working on the truck lock hubs in and all works fine. First thought is the vacuum system has a leak or something of the sort. Had truck at the shop they are telling me the GEM module controls the vacuum to engage the auto hubs and the signal is not coming from the GEM and it need to be replaced. It was the GEM causing the problem.
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I have a 2005 f350 with the power stroke I went through the hole vacuum system all new hubs, seals, vacuum actuator and fixed it all now I'm having the reverse problems everyone has my hubs are locked all the time as soon as I plug in the vacuum actuator the transfer case is still in 2wd and will switch 4x4 and work and disengage but the hubs are always in unless I unplug the actuator ...
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1999, F250, SD, v10, Auto, 4x4.
My light on the overdrive is not coming on and the overdrive does not seem to be working. I had a new transmission installed a few weeks back. Wasn't working prior to this.
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Checked the EOF vacuum lines and pump but still have a problem. The EOF works and locks the hubs when I switch to 4x4 high, Easy to feel when you turn the wheels but it will not go into low. The light on the dash does not light up the word "low".
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I have a 2006 F250 Super Duty w/ turbo Diesel. Took to dealership for "hopping" feeling when turning sharp. Was told that 4 wheel drive solenoid was bad. Where this solenoid is located? I know I can fix but want to know where it is located.
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So after eight years my Warn premium hubs have taken a crap and developed major play internally. After speaking to Warn warrenty department and sending videos they will replace them according to the lifetime limited warranty. Problem is they sill not send out new ones until they receive the old ones, so I was told from time i remove mine and send them back and get the new ones it will be two weeks maybe a few days more, there is no snow in the extended forcast and im wondering what damage could occur with me funning the truck everday to work etc with the stub shafts just hanging there?
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I purchased the truck used last summer and this is the second time I've put it in 4wd. The first time was over the summer, and I had a hard time getting it into 4wd, and it made a "clunk" sound initially but drove fine, then went back into 2wd just fine and had driven fine ever since. Today I put it into 4wd, no clunk or any other noises, very smooth, but it drove very rough, almost as if the wheels were out of sync or something. It seemed almost like the wheels were breaking on and off on their own, very weird. When I put it back into 2wd, it did that for a few seconds until it went away. I only drove it in 4wd in my parking garage as I didn't want to risk any more damage to it on the road.
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I just got a 99 F250 PSD, it had not been in 4wd in a while, now the hubs won't unlock.
My 01 F250 seemed to have strictly manual hubs. Turn right to lock, left to unlock. They may have been aftermarket, but on by the PO. Do I need to put some new Warns on the 99? Or can I lube then up and get them functional.
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Brings back memories of my many projects from back in the day. Anyway, my uncle has this f250. He said 4x4 wouldn't automatically lock the hubs in. I tested the vacuum pulse valve on the fender and changed it out. Now the hubs will lock in when you turn the light on the dash but it will not unlock the hubs unless you go outside and manually turn the hubs to engage then back to auto. Only then will the front end be unlocked. I notice small puffs of air blowing back from behind the hub themselves so I was thinking it's time to reseal the vacuum portion of the hubs.
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I have a 2010 F250 with 154000km (96000 miles) that we bought last week. When I was looking it over during the purchase I noticed the front axle didn't lockup in "auto", in manual lock it seemed fine so I figured vacuum leak or something like that. Yesterday morning I was in the yard and got a little hung up in snow drifts so just got out, locked the hubs and switched to 4x4 and I think the front end didn't engage at all.
So later on I had it in the shop installing the two way radio and decided to check the front end out a little more thoroughly. Vacuum lines seem fine, hubs turn fine but I notice the axle shafts both move up and down almost a quarter inch, that seems excessively loose to me. I've been doing some research on the internet and it appears the front hubs are serviced as a unit, also some information seems to point to needle bearings within the actual locking hub mechanism itself?
So the questions:
1. Does that front axle shaft seem excessive? What are the specs?
2. Can I replace bearings and seals only or do these units come only as assemblies? Inner hub, outer hub units? Wheel bearings seem fine.
3. With that much play is there a chance the outer axle shafts are worn also?
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On my 2008 f250 I can not turn the hubs without a set of pliers...does that mean I need new hubs....
What auto tranny do I have with the 5.4.. is it a six speed...
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Okay this is what I got; I recently purchased high mileage 2004 F250 Super Duty short box super cab 5.4 liter. Came with manual 4x4 handle on the floor so no 4 wheel on the fly and this eliminates the vacuum for the auto hubs so this will not be part of the problem. When engaging the hubs and ONLY when engaged the driver side hub grinds. The 4 wheel drive works but it sounds like its ready to grind itself into oblivion. I did pull the hub and the grinding was gone, I happen to have a spare hub that is good and the grinding returned.
I have jacked it up and made sure I have no play in the wheel itself and the axle knuckle on the axle shaft. Some say remove the front drive shaft? Or turn the wheels all the way in one direction engage the hubs and check for binding? I will do this in the morning, but what does that confirm if it not the hub. Could it be the passenger side echoing across? On my 99 Super duty I kept hearing moaning coming from up front like the breaks were shot and if you stuck your head out the window it was the back echoing to make it sound like the front.
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I have a strange thing going on with my hubs i think. I have a 2000 f250 7.3 4x4 that I just purchased. Lettering on hubs were worn out as far as labeled locked or unlocked so I tried to turn the axel to see what position they were in. Drivers side spun freely but passenger side did not. Both hubs were counter clockwise and turning it to lock didn't change a thing.
Figured it was a bad hub so I jacked the front drivers side up. Spun tire with both hubs unlocked and axle didn't spin. Locked hub on drivers side and axle spun. Indicating the passenger side was unlocked. Then I locked passenger side and wheel would not turn. Ok. That seems right.
Jacked up passenger side front tire with drivers side on ground and axle spins no matter if its locked or unlocked. So does this indicate the hub is good and I should look at something else or could it still be the hub. Axle spins all the time and I don't want to wear anything out.
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