4x4 not working?? - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 01-17-2011, 08:35 AM Thread Starter
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4x4 not working??

i got into some slick **** at the ranch yesterday and flipped my 4x4 switch to 4 high and nothing...put it in neutral went to 4lo and it geared down the rear axle so i thouht it came on and when i looked out the window the front tires were not spinning...i know i have hubs that i can lock but i shoudnt have to lock them right?

or do i have to lock them to get into 4x4????

thanks in advance for the feedback3

truck is 2008 f350 4x4 king ranch with electronic 4x4 switch (not floor shifter)

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post #2 of 7 Old 01-17-2011, 08:57 AM
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Quote:
Originally Posted by THE SILVER BULLET View Post
i got into some slick **** at the ranch yesterday and flipped my 4x4 switch to 4 high and nothing...put it in neutral went to 4lo and it geared down the rear axle so i thouht it came on and when i looked out the window the front tires were not spinning...i know i have hubs that i can lock but i shoudnt have to lock them right?

or do i have to lock them to get into 4x4????

thanks in advance for the feedback3

truck is 2008 f350 4x4 king ranch with electronic 4x4 switch (not floor shifter)
You shouldn't have to lock them in but sounds like there is a problem with the auto feature. They make them that way so if the auto feature fails you can still use 4x4.

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post #3 of 7 Old 01-17-2011, 09:37 AM
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Quote:
Originally Posted by THE SILVER BULLET View Post
i got into some slick **** at the ranch yesterday and flipped my 4x4 switch to 4 high and nothing...put it in neutral went to 4lo and it geared down the rear axle so i thouht it came on and when i looked out the window the front tires were not spinning...i know i have hubs that i can lock but i shoudnt have to lock them right?

or do i have to lock them to get into 4x4????

thanks in advance for the feedback3

truck is 2008 f350 4x4 king ranch with electronic 4x4 switch (not floor shifter)
The reason you have manual locking hubs on the front is if you are in a situation where you need 4 wheel drive and your truck is stuck. (cant move forwards or backwards) The Auto 4x4 system requires you to roll forward or backward a little after engaging the auto 4x4 system to lock the front wheels in. If you are just standing still, you need to turn the switch to 4x4 inside the cab, and then get out and manually lock the hubs.

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post #4 of 7 Old 01-17-2011, 09:46 AM
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It sounds as though you may have a vacuum leak that is preventing the hubs from locking in the 'auto' mode. Try this, take the truck out on some dirt(gravel, dirt road) with the truck rolling and see if they will lock. If they do, you may not have a problem. Like the guys stated, the truck must be in motion for them to lock in auto. If you're stuck, then you need to lock them. Good luck.

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post #5 of 7 Old 01-17-2011, 10:50 AM
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I don't think the truck needs to be rolling to lock the front in. I think it just requires relative motion so it the front drives shaft spins over it will do the same thing as rolling the front tires. The reason I say this is I was pulling a friend out of a ditch with mine ( my truck was also on dirt and its a 08 f350) and in 2WD it just spun. Flipped the switch to 4WD , never took tension off the tow strap, pulled her right out (didn't get out to lock in the hubs either).
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post #6 of 7 Old 01-17-2011, 03:05 PM
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I bet you have the same issue that has plagued these trucks since 1999. I bet you have some dirt in your seals that is preventing the hubs from vacume locking. Judging by the pic in your sig you spend some time in the sand, which could easily get into the hub seals. Take them apart, clean, and grease everything and I bet they start working again....

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post #7 of 7 Old 01-17-2011, 08:21 PM
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Vacuum pump on drivers side at small end of degas bottle near fender. You see it when you open the hood. Check if pump motor runs and if it pulls a vacuum. If vacuum is good at the pump but not when hub distribution hose is connected you have hose problem between pump and one of the hubs.

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