Go to
www.vindecoderz.com and put in the VIN # there. Be sure you put it in the actual VIN lookup, not the popup add in the center of the page.
Scroll DOWN - The Recall report is probably accurate, the history report section is just people with similar VIN #'s reporting problems. At the very bottom of the page, you'll see the original options for your VIN#
Scroll WAY down and you'll see the axle options
In my case it says "Rear Axle Limited Slip Differential"
I also notice a code "D4" on the tag on the driver's door in the "Axle" section, if yours is also D4 then you probably have a limited slip differential as well.