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post #1 of (permalink) Old 06-12-2008, 04:35 PM Thread Starter
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Question Help! Posi-trac question

I just got out muddin this past weekend and got stuck. After checking out the situation i found only me passenger rear tire was pulling while my driver rear tire was on solid ground. So i called the Dealership with my Vin today to ask what kind of rear end was assembled in my verhicle.

The guy i spoke with was quite certain that all 97 yukon 1500's with pushbutton 4x4 were equipped with positive traction rear ends.

So to you guys i ask, are there any checks i can make to determine if the rear end i have now is posi-trac or not and what should i check to determine if the rear end is savable.

I really dont want to stick another rear end under it unless i am going up to a 3/4 ton.


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post #2 of (permalink) Old 06-16-2008, 12:22 AM
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Posi-trac Problem

Block the front tires so the vehicle cannot roll in either direction.Then the easy way to check for open or posi-trac differentials is to jack the rearend up untill both wheels are clear of the ground. Once you have done that be sure that the transmission is in neutral and grasp the tire and turn the wheel toward the front of the truck ( ie start at 12:00 and go to 9:00 ) If the wheel on the other side goes the same way as the one you are turning then it is a posi. If the wheel on the other side goes in the other direction then it is an open differential.


post #3 of (permalink) Old 07-16-2008, 12:15 AM
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Having pushbutton 4x4 is in no way an indicator of having a posi. Open up your glovebox, look for the sticker with all the 3 digit codes on it, those are you RPOs, or Regular Production Options. Code G80 = Eaton "Locking" Differential. Locking is in quotes because that is what GM refers to it as, in truth it's a little POS with too many undersized moving parts that like to break and wreak havok to unsuspecting people.


2007 GMC Sierra Classic 2500HD SLT, 4x4, EC/LB, LBZ/Allison, Summit White with Charcoal Leather, dealer installed Westin Platinum Series bars and a Line-X.

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