Mechanics

FRONT DIFFERENTIAL WILL NOT ENGAGE IN THE FOUR WHEEL DRIVE POSITION.

1998 Ford Expedition • 120,000 miles

The two wheel drive engages firmly when in the two wheel position. When in the four wheel drive position, the front differential will not engage all the way. It lacks about one half of an inch before it completly engages the front differential. You can manualy engage the front differential when it is in the four wheel drive position. I have all ready replaced the V.C. Motor on the front differential.
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Milton Miller
November 26, 2011.




Describe what happens when you try to engage. Is it a hub issue or transfer case?

I have on the fly four wheel drive. The transfer case does engage. It's some where in the vacuum assist. I have all ready replaced the vacuum control motor (vacuum pod) on the front differential. I'm having trouble with the front differential engaging all the way in 4X4. Could it be one of the two vacuum solonoids? Or could the vacuum on the pod not be purging all the way on the four wheel side?

Tiny
Milton Miller
Nov 26, 2011.
Confirm the vacuum is present to them and yes, it could be.
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