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Chevy Tahoe 2001

Front wheels do not turn in 4wd modes. Front driveshaft is turning and actuator does move. I removed actuator and observed the motion when 4wd drive is selected. Mobil synthetic 75w 80 is in the front diff.

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Place vehicle in 4wd (high or low). This will hold the front drive shaft still for the rest of the test. Jack up the front end of the vehicle. Remove the actuator. Have a buddy spin the right front wheel while you use a long punch or screwdriver to try to manually engage the diff. The left front wheel should spin in the other direction if the diff is good. Also before you check the diff you need to grab the front driveshaft and make sure it is locked, If it spins freely when the truck is in park and in 4wd with the front end raised then problem is in transfer case. If you can't make the diff engage manually with punch then the problem is in the diff. If front diff engages manually then the problem is the actuator. Hope this helps..

Posted on Nov 27, 2008

  • conrad alexander Oct 12, 2011

    what sort of tool will i need to remove the actuator ?

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SOURCE: Front wheels do not turn

I did run the vehicle on the lift in 4wd. The actuator is trying to engage. I removed the right side axle housing and found the shim on the end of the shaft had fallen out of place. The small roller bearing in the shaft was damaged as well. This may have happended on a previous axle seal replacement. A new shim, and bearing fixed the problem. Thanks for our reply

Posted on Nov 28, 2008

6ya6ya
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Front wheels do not turn in 4wd modes. Front driveshaft is turning and actuator does move. I removed actuator and observed the motion when 4wd drive is selected. Mobil synthetic 75w 80 is in the front...


I did run the vehicle on the lift in 4wd. The actuator is trying to engage. I removed the right side axle housing and found the shim on the end of the shaft had fallen out of place. The small roller bearing in the shaft was damaged as well. This may have happended on a previous axle seal replacement. A new shim, and bearing fixed the problem. Thanks for our reply

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