How To: Find and Diagnose ESOF Hub Vacuum Leaks

[TreySpooner65]

If the Autolock hubs on your ESOF equipped Ford SuperDuty do not lock or engage when you switch into 4x4, chances are you have a vacuum leak. This video will show you, step by step, how to find, diagnose, and to some extent repair the most common causes of this break down in the ESOF system.

How To: Find and Diagnose ESOF Hub Vacuum Leaks - YouTube

How To: Find and Diagnose ESOF Hub Vacuum Leaks - YouTube

[cowens726]

Nice video man, I've watched a couple you've done now pretty thurough and helpful Just a question though, I've got the ESOF but the previous owner replaced the hubs with Warn units. Since they are not the stock hubs, do they still operate like original or are they manual operation only. I prefer to manualy lock the hubs anyway but it would be nice to know just in case the wife needs to drive the truck and need 4x4.

[TreySpooner65]

Originally Posted by cowens726

Nice video man, I've watched a couple you've done now pretty thurough and helpful Just a question though, I've got the ESOF but the previous owner replaced the hubs with Warn units. Since they are not the stock hubs, do they still operate like original or are they manual operation only. I prefer to manualy lock the hubs anyway but it would be nice to know just in case the wife needs to drive the truck and need 4x4.

Aftermarket hubs are only manual operation. But that shouldnt be a problem. Like you said, its easy to just get out and lock them.

[cowens726]

Right on, thanks.

[dieselcrawler]

I need to check and repair the vacuum system on our Ex, but I do know that I need replacement auto hubs. Any ideas where I can find them for sale? Would prefer new ones, not used from a junk yard. The stock auto hubs it came with were froze up, so I swapped them out for some used standard hubs I had from my yellow truck just so 4x4 would work, but the better half says she doesn't want to have to get out in the cold and snow if she needs 4x4, so I better find some before she gets stuck!