I wish but I don't think so. The build sheet on my 2006 said "3.92 ratio" and then under it "Anti-spin differential". The build sheet on my 2004 says "3.92 ratio" but nothing under it. Also, as noted above the tag on my rear end says "3.92 open".To the best of my knowledge all 3.92 rear axles of that era were Anti-Spin.
Hmmm....that's weird. I still say get your build sheet, lol. It will tell you for certain. Or if you can't wait, call the dealer and give them the VIN....they can tell you. Just make sure you specifically ask if it says "anti-spin differential" in addition to the ratio. I will try to crawl up under mine and look again later this evening and see if I see any tags other than the one I saw the other day.Tag says 3.92. Sticker on end of axle tube says 3.55 open case.:4-dontknow: