Autohub unlocking? - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 01-19-2011, 12:32 PM Thread Starter Rookie
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Autohub unlocking?

Noticed when I'm in 4hi with hubs in the "auto" position, they unlock when I come to an extended stoplight. When I start out, just the rears spin and then engage after I left off the pedal.

Is this normal? They are vacuum actuated right? Could I have a leak or just not pulling enough vac at idle?

Considering it's been snowing just about everyday since November, I switched to the locked position, but the autolock is helpful when going from clean to unclean roads so I'd like to figure this out.

Thanks in advance.
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post #2 of 2 Old 01-30-2011, 08:18 AM
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Yes they are vacuum operated. Have you notice that your heater/ac moves to the defroster position? If so then you have a vac leak. I do and have been searching for a thread that talks about it. Haven't found it yet, but when I do I'll let you know.

02 F350 CC 7.3 PS, auto, 6x6, 4.10 gears LB. AFE stage 2 intake, 4" AFE SS exh, 6.0 atf cooler, DP tuner with five stages Eng Temp gauge, EGT guage and Trans temp gauge. J.Woods valve body ATS turbo housing. Cooling sys filter & waterless coolant. NON WORKING POS FASS fuel filter sys. Brightbox headlites. I don't care what they say "There's no replacement for displacement." Don't believe statements about anything being better than a 7.3
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