GU6 3:42 Rear Axle is it a posi ???? | GMC Truck Forum
May 18, 2009 · Joined May 23, 2005. ·. 11,334 Posts. #6 · May 17, 2009. Look in the glove box, right next to the gu6 will be g80 if it has a factory locker. low4x4 said: just jack up the rear wheeels, turn the right side so it would be going forward....if the other side is going in the same direction..its a posi....if its going in the oppisite direction it not.
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