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2005 is new enough it may have a computer controlled auto locker. If not look for a switch that says diff lock  or shows a picture of the rear-end with an X in the middle Ill see if i can find a picture

I called Newell who said ZF axle did not come with diff lock. said lifting tag can help increase traction in snow. said he was unaware of anyone using chains. we have a foot of snow in foothills of Denver, never driven in snow.