anyone heard of a stock tj w. 307 coming from the factory with positraction? i redid my gears today, and when i went to take out the rear carrier, my buddy told me it was a posi. i then put the 456 ring gear on it, and lo and behold, it fit!!! just wondering if this came as an option, or if i got a freak of nature? ohh the rear end is a dana 35.