Originally Posted by DRILLROCK
On my 05 f-350 I have to get out and turn the hubs to lock, I thought I had a vacuum leak somewhere and I checked all lines and pump but no leak, vent moves to defrost when I turn electric switch to 4wd, so I gave up looking for the problem till one day I was going through deep mud and water, when I got to where I wasn't going to need 4x4 anymore, I got out to turn hubs back to auto and when I did the letters FORD on hub lock outs started blowing bubbles ( when I turned them to auto ) which now makes me think my vacuum leak is on the inside of my hubs, or that I need to replace the hub dials. Any ideals ?
I had the same issue with my SD. My vents would never shift from defrost wich is the "failsafe" factory default when you have an issue. The vents are vaccuum controled and so are your auto hubs, and obviously you have an issue with the hubs. IMHO you should not waste your time with the factory garbage they put in there. My very first upgrade was the warn locking hubs. I found them at a local shop for around 300 bucks in Canada so you should be able to find them quite a bit cheaper. Lifetime warranty if I'm not mistaken. Bout a year later I clued in.. My hubs were pooched, my heater has been stuck on defrost for a while.. I then deleted the lines that went down to the hubs from the vaccuum pump and voila!! About 10 lbs of crap blew out of my vents.
NOW.. you may be able to fix the auto hubs if you would like to keep them or if your strapped for cash, but like I said, I'll take reliability first and I trust warns.