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Truck stuck in four wheel drive

Tiny
JAYAR BELISLE
  • MEMBER
  • 1999 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 240,000 MILES
When in drive/reverse out of a parking spot or make a turn truck makes a humming, clunking, and slows down or stops and have to give it more gas to move. When I drive straight all it does is hum. When I turn the electronic 4x4 knob the 4x4 light turns on and I hear relay clicking.
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Saturday, April 6th, 2019 AT 12:34 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like the encoder motor is seized up not tracking correctly. Here is a diagrams so you can remove the motor to see if it is working correctly. Please check it out and get back to me.

Check out the diagrams (below). Please let us know what happens.

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Monday, April 8th, 2019 AT 1:13 PM
Tiny
JAYAR BELISLE
  • MEMBER
  • 6 POSTS
I removed the shift motor and the transfer case was already on 2 hi and the video is the shift motor switching AWD to 4 HI to 4 LO back to 4 HI to AWD.
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Tuesday, April 9th, 2019 AT 3:56 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Thanks for the video, yes that seems to be working fine, can you tell where the noise is coming from?
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Tuesday, April 9th, 2019 AT 11:39 AM
Tiny
JAYAR BELISLE
  • MEMBER
  • 6 POSTS
The noise is coming from the front of the truck.
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Thursday, April 11th, 2019 AT 6:12 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Can you go for a ride and take a video so I can see what is going on?
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Friday, April 12th, 2019 AT 10:10 AM

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