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4x4 will engage

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Old Apr 17, 2010 | 01:01 PM
  #1  
wbmiller's Avatar
wbmiller
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4x4 will engage

I have a 1993 with 351 the 4x4 will not lock in when you push the button. Any help would be great.

Thanks brian
 
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Old Apr 17, 2010 | 01:07 PM
  #2  
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f100beatertruck
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I'll assume it's electric. Can you hear the motor run? If not then check fuses.

If it's anything like the explorer unit there's a little plastic bushing in the motor that keeps it from over centering off and not making an electrical connection. If you look around the vacuum T help section you can find one that's the right size to fit over the metal pin and replace the worn or broken stock piece.
 
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Old Apr 17, 2010 | 10:06 PM
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I here the motor trying to engage. But not sure were it is or what to look for on vacuum part your talking about
 
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Old Apr 18, 2010 | 12:30 AM
  #4  
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Welcome to FTE and the Big Bronco Forum. We will do our best to get you the most accurate info we can dig up.

Before you go too far, are you sure you are actually hearing the shift motor moving? Or are you hearing the relays in the shift control circuit clicking? In my experience, hearing the shift motor moving through the floor boards is nearly impossible. Unless you are under the truck listening while someone else pushes the button, its a nearly impossible feat.

May we assume that the 4HI indicator does not remain lit and therefore it is assumed that the 4WD is not engaged? Does the indicator light at all when the button is pressed? Have you observed the shift control circuit (behind the passenger side kick panel near the floor)? It has a red LED that should blink when the button is pressed and come on steady once the shift motor is locked into one of the 4WD positions.
 
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Old Apr 18, 2010 | 06:23 AM
  #5  
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helirich
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Crawl under the truck and remove the shift motor. (I believe three bolts) Then push the button. See if turns the socket. You can grab the shaft with a visegrip and shift it manual.
 
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