Originally Posted by MacGyver76

Thanks for clearifling that for me.. but that is the only hose other than the brake line.. so either they took off auto with a hub swap or lines were damaged so they took off.. How can I find out if the hubs are auto/lock or freespin/lock hubs? too warn around the edge to read anything..

Thanks again..

Originally Posted by _Rick_

MacGyver76,

Here's a couple of photos of one of my old EFOS hubs. Maybe the grip and basic shape can help you determine if you have the auto hubs or not.

Rick...

*SNIP*

Originally Posted by MacGyver76

Ok now im really . According to this thread. This is what they said below:
So is this why mine won't auto engage?

My hubs look simular to _Rick_ minus the hoses. It has a rubber stop cap on it. So could I add for it to be auto locking on the fly?

Thanks

Originally Posted by _Rick_

Correction from previous post:
ESOF not EFOS. argh,,, The edit botton disappears too fast for my bad speeling neads.

MacGyver76,

Do you have the shift on the fly switch on your dash? or a manual floor shift?

- Switch On Dash = YES you should be able to get auto lock working (with correct hubs, vacuum solenoid, vacuum lines and working dash switch)

- Shift On Floor = NO auto lock,,, unless you invest pretty big money into transfer case and other parts needed.



Rick...

Originally Posted by MacGyver76

Sorry, could of swarn I put that in there.. Just got off a 1600 mile trip. Now getting up and around to go to Wisconsin and Chicago. So was little tired last night..

Yes mine is the floor shift.. Of all the post that I read about people having issues with the front diff non said anything about the dash or floor shifter till that one post. Wasted so much hard drive space asking and try to figure this out.. .

Truthfully, I didn't think they made manual only hubs anymore since the 80's etc.. DOH!!!

Thanks for all your help though.. Sorry for wasting everyones time..

Originally Posted by Krewat

Ah, I guess this worked out in the end

Some of the confusion comes from certain trucks having the shifter on the floor, but "auto locking hubs". Not sure if it's other brands, or other years of Ford trucks, or both, but there exist some trucks that you can shift into 4x4 with the lever on the floor, and they have a vacuum system that will lock the front hubs.

As in, the Ford F150. It has no manual hubs. It does, however, have a vacuum system that locks the axles at the front differential (independent front suspension) and doesn't have "locking hubs".

Originally Posted by _Rick_

MacGyver76,

No problem with the time. At least you got to the bottom of your investigation.
Don't be disappointed with the fact you have a manual system. Odds are it will end up saving you or the next owner of your Truck some money because the ESOF system is known to fail causing headaches. I will fight to the death to keep mine running smooth simply because I like it (when it's working properly).
I found out only a few days ago after testing my system with a vacuum gauge I need to replace my hub assembly yellow o-ring (drivers side). I will end up doing both sides for piece of mind, but for me it's worth the effort.

Rick...

Originally Posted by 2003RedSuperDuty

Switch is in 2WD. 4WD indicator light comes on at 30MPH. Hubs ingage (can tell at 55MPh easly and when turning). Transfercase is not ingaged.

Switch does not work at all can not ingage 4L or 4H.

Originally Posted by Krewat

Incorrect.

Gassers do not have vacuum pumps, they use intake manifold vacuum.

Originally Posted by DropZoneExcursion

To clarify on my previous post, Those steps only work for Ford Diesel. Gas engines have there own vacuum buildup from the engine itself. Sorry for any confusion.