duct tape & zip ties
Join Date: Jul 2006
Location: Willis, MI
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Most likely it is a vaccuum leak. There is a seal inside the wheelbearing assembly. If that goes bad you loose vaccuum. Which in return does not allow the hub to lock automatically. I would do a vaccuum test on each hub. To see if it is holding a vaccuum. When I replaced my wheelbearings I found out that the passengerside seal was bad. Which is why my hubs would not lock automatically. Now I just lock them in manually.
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2005 6.0 Crew Cab Long Box Lariat, current truck
2004 6.0 destroyed by contaminated fuel
2002 7.3L burnt