Question about GMC Yukon XL
Posted by Anonymous on
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Posted on Jan 02, 2017
Go to the autozone.com website and register there. It doesn't cost anything and you will have access to an online repair manual for the vehicle. (Kinda handy) They have a specification section, so the torque specs might be found there. Hope this helps and best wishes.
Posted on Aug 18, 2009
Testimonial: "hey thanks for the help"
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.
If I were you, I would buy a new heated actuator. They are available at most auto parts stores, and are about $90. They are also on eBay for about $55 plus shipping. These are very easy to change - just thread out the old one, and thread in a new one.
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 02, 2010
Testimonial: "This is exactly the info i need to troubleshoot and repair efficiently complete with wire numbers and colors thanks for the help buddy"
do not replace only the bearing. replace hub assembly. remove rim/tire , remove caliper, mounting plate, rotor. . un bolt hub assembly, unplug abs. remove front axle nut if 4x4. you may need to rent the axle nut remove kit and hub puller. pull out hub. drive axle reward out of hub. install new part. do not torque hub over 90lbs. check with parts sell for spec
Posted on Jan 03, 2010
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