F150 4X4

2004 Ford F-150

Drive Train Axles Bearings problem
2004 Ford F150 V8 Four Wheel Drive Automatic 40000 miles

my 4 wheel drive is trying to engage going down the road someone told me it worked off a vacumn. How can this be fixed, can you replace a vacumn cannister or a switch?
April 4, 2009.

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