Front drive shaft spins when in 2H

Tiny
BLANKFORD101
  • MEMBER
  • 2000 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 139,000 MILES
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.
Saturday, July 20th, 2019 AT 9:13 AM

5 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
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.
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Sunday, July 21st, 2019 AT 4:36 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
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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Sunday, July 21st, 2019 AT 4:39 PM
Tiny
BLANKFORD101
  • MEMBER
  • 2 POSTS
KASEKENNY1, Can you clarify what you mean by actuator. What is it and how to remove it?
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Monday, July 22nd, 2019 AT 10:50 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
The encoder and actuator are the same thing.
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Monday, July 22nd, 2019 AT 11:00 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
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.
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Monday, July 22nd, 2019 AT 11:33 AM

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