06 F-250 6.0 Powerstroke... 4x4 not working, transfer case engauges and locks front drive shaft but I can still turn the front axles by hand at the hub... any ideas?

Asked by Nov 18, 2013 at 09:50 AM about the 2006 Ford F-250 Super Duty Lariat SuperCab 4WD SB

Question type: Maintenance & Repair

06 F-250 6.0 Powerstroke... 4x4 not working, transfer case engauges and locks front drive shaft but I can still turn the front axles by hand at the hub... any ideas?

3 Answers

240

if you have shift on the fly the shifting fork in the dif might be broke or not engaging

28,475

the hubs are vacuum actuated. its usually a bad actuator they are mounted on the firewall on passenger side. sometimes there are broken vacuums lines causing a leak.

2 of 2 people found this helpful.
40

The hubs are indeed vacuum actuated and sometimes the vacuum lines themselves are the culprit. Most of the time, however, the issue is that the hubs haven't been serviced -ever- and the o-rings inside are damaged which prevent the air seal necessary to lock them in. To get around this issue temporarily, you can manually turn the hubs clockwise -on both sides-. Just remember 'clock to lock'. Don't wait on the hub service, though. Replacements are pricey and the kit is cheap.

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