Question about 1997 GMC Sierra

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97 sierra put truck in 2wd have clicking drivers front put back in 4wd went away

Put in 4wd then in 2wd clicking niose started but back in 4wd went away back in 2wd came back

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  • 331 Answers

First guess would be to check the drivers side, CV-joint assembly. After that is "OKed" then I would move to the front output shaft and then onto the rear drive-shaft. Checking for bad U-joints. Let me know if that helped.

Posted on Feb 28, 2014

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Some one told me to unhook the batery for half an hour then hook it back up and try it. Well it worked,no more shif problems.

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SOURCE: 2004 GMC Sierra 1500 4wd. Auto transfer case light issue

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Posted on Sep 17, 2009

Molson02536
  • 3854 Answers

SOURCE: CHECK 4WD WARNING CAME ON. AFTER TURNING ENGINE

On the full size, the front actuator is electric, not vacuum.

When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts.

Posted on Jan 04, 2010

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Molson02536
  • 3854 Answers

SOURCE: Had 2001 GMC Sierra in 4WD Auto and went to put in

On the full size, the front actuator is electric, not vacuum.

When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts.

Posted on Jan 07, 2010

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