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4X4 not engaging?

Tiny
FLYNTJ
  • MEMBER
  • 2003 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 94,000 MILES
When I turn the 4x4 high on the light comes on showing its on but does not engage the 4x4, the 4x4 low u can feel it kick in but also does not engage what possible problem could this be?
Monday, December 28th, 2009 AT 10:17 AM

2 Replies

Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Hi
when you push the button two things happen.
The first is a elec motor on the side of the transfer case puts the transfer case in 4 wheel drive.

The second is locking the front axles so they spin the wheels this is also done with an elec motor. Or with auto locks depends which your truck has.

An easy way to tell jack the rear wheels up have someone look under the truck put in drive is the transfer case shaft turning while switch in 4x4 position. If yes prob in front axle.

If no prob is in transfer case actuator.

Either one of these motors can usually be disassembled and cleaned. This will normally repair the prob. If not they need to be replaced.

Hope this helps. Feel free to write back. Billymac
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Tuesday, December 29th, 2009 AT 1:46 PM
Tiny
FLYNTJ
  • MEMBER
  • 1 POST
Does the vaccum control motor contorol the auto locks? Or r they locacted somewhere out on the hubs? Your info has been extremely helpfull thanks
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Wednesday, December 30th, 2009 AT 8:58 AM

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