4 x 4
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Elder User
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From: Bellville TX. Wof Houston
4 x 4
New to 4x4 2000 F250 SD, while on a gravel road yesterday, up hill, I switched to 4x4 herd it engauge, took off, loaded with trailer, rear wheels would spin, put it in low 4x4 again same results. wondering why the front wheels didn't spin. seemed like the 4x4 was not working.
I have the hubs set on auto. did'nt try it in lock.
thanks
I have the hubs set on auto. did'nt try it in lock.
thanks
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Elder User
Joined: Mar 2006
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From: Bellville TX. Wof Houston
So If I hear the transfer case engaugeing, that means it's in position to be in 4 wheel drv, BUT because of a vac issue. it's NOT 4x4 ?
Sorry just a little conrussed here
Sorry just a little conrussed here
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When the front hubs are in the "AUTO" position, vacuum is used to engage the hubs when the you put it into four wheel drive along with the shift motor putting the transfer case into four wheel drive. Both systems need to be working to have 4wd.
Most likly you have a leak in the vacuum lines running to the hubs. You are hearing the transfer case going in but the hubs are not.
Try locking the hubs in manually and engaging the four wheel drive switch. It that works, look for the vacuum leak. You can pull the vacuum lines from the front hubs and see if it is pulling a vacuum. If not, you have a leak leading to the hubs. If it has vacuum, the leak is in the hub o-ring.
Some people experience the heater moving to defrost mode when there is a leak in the 4x4 system.
Most likly you have a leak in the vacuum lines running to the hubs. You are hearing the transfer case going in but the hubs are not.
Try locking the hubs in manually and engaging the four wheel drive switch. It that works, look for the vacuum leak. You can pull the vacuum lines from the front hubs and see if it is pulling a vacuum. If not, you have a leak leading to the hubs. If it has vacuum, the leak is in the hub o-ring.
Some people experience the heater moving to defrost mode when there is a leak in the 4x4 system.
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Elder User
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From: Bellville TX. Wof Houston
Ok thanks. this really clears it up for me. I was having problems understanding Y I could hear the transfer case enguaging, but didn't have 4 wheel drv.
thanks again.
thanks again.
Hotshot
Joined: Mar 2001
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From: Manhattan, KS
Also, sometimes if the truck doesn't move at all the front won't lock in. It takes a little movement sometimes to get it to slip into the splines on the hubs. You might check that before tearing a bunch of stuff apart.
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From: Long Island USA
And, it has to be within the first 40 seconds after turning the switch to 4x4. The initial vacuum pulse is only around 40 seconds long. After that, the hubs will not auto lock.
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I had the same problem and my vac. lines from the chassy to the wheel were broken. $3.00 worth of hoses got it back online. 2 years later a wheel bearing went bad, seal failed and the 4wd quit again. New wheel bearing and seal fixed this. This was not a 4wd ESOF issue but a bearing failure. I like and keep my ESOF functional. Nice being able to use 4WD without getting out of the truck.
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Hook it, I'll pull it.
Joined: May 2007
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From: Grand Lake, La.
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Elder User
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From: Bellville TX. Wof Houston
Follow up !!!!!!!!
today I replaced the vac lines " they were shot to hell "
put her in 4x4 " on dry pavement - just for a little while "
NOW I think I'm gonna have to do to the doctor.....
I think I have whip lash.
Working too well,
thanks everyone
today I replaced the vac lines " they were shot to hell "
put her in 4x4 " on dry pavement - just for a little while "
NOW I think I'm gonna have to do to the doctor.....
I think I have whip lash.
Working too well,
thanks everyone
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Glad you got her fixed, and thanks for telling us what the problem was.
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From: Long Island USA
This is not the first time I have seen this posted. I have been stuck in my pasture a few times, I turn the switch to 4X4 not moving, because I am stuck, then I start moving thanks for the front assist. This has happened at the beach in the sand also. I wonder why mine works like this but not the others.
There is, however, a chance that the splines are not lined up, and the hub won't lock. Then, you have to lock it by hand, OR - bounce the suspension once or twice then turn back to 4x2 and back to 4x4, and it'll go in. Don't try it with the rear wheels spinning though. GRRRRRIIIIINNNNDDDDDD....
To the OP, glad it works
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