[1774btcrew]

I don't have any references. I have a parts locating business and have been selling parts on ebay for a living for the last 10 years. Posi units are a big part of my business. I only pull them out of functioning rear ends. Since these are parts that I pull from parts cars. I really have no way of telling how old they are. They are visually inspected for any abnormal wear and made sure to have no visual damage. This would already be in my personal truck if it didn't already gave a gov lock unit in it.
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