Front drive shaft spins when in 2H

2000 CHEVROLET TAHOE
139,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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BLANKFORD101
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When I slowly back up I can feel a vibration. Put it on a lift and it turns out that when It is in 2WD 2H it is spinning the front drive shaft. I can put it in 4WD and the front transfer case engages and works. Comes in and out of 4WD fine. Curious if the Transfer Case shift motor needs to be replaced or is it an other issue? Everything else works.
Jul 20, 2019 at 9:13 AM
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KASEKENNY
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Hi Blankford,

This sounds like a possible shift motor but it could also be something inside the unit not releasing 4WD. However, I would suggest to just remove the actuator and see if you can manually shift the transfer case and see if you can get it into 2WD. If you can then the actuator is your issue.
Jul 21, 2019 at 4:36 PM
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STRAILER
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Yep, the front drive should not be spinning so it sounds like the encoder motor is not working right here are diagrams and instructions to help you fix the problem. Check out the diagrams (Below). Please let us know what happens.



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Jul 21, 2019 at 4:39 PM
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BLANKFORD101
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KASEKENNY1, Can you clarify what you mean by actuator. What is it and how to remove it?
Jul 22, 2019 at 10:50 AM
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STRAILER
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the encoder and actuator are the same thing.
Jul 22, 2019 at 11:00 AM
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KASEKENNY
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Yes. Sorry. I meant to include the same attachments that Ken did. Saved them to my computer and forgot to attach them. Other OEMs call them actuators but it is what Ken attached to the first post. Thanks.
Jul 22, 2019 at 11:33 AM