The "s" is the surefire way to find out if you have LSD, it can located on the top side of the diff i believe driver side portion. I don't know how much space there is to get in their, but you'll probably have to get in their with mirror and flashlight. Also, im not sure if all have it but there is a green sticker with an 's' if not then there also should be some kind of metal tag with an 's' and the gear ratio and some other numbers enscripted on it. P.S. aren't both rear wheels suppose to spin in the same direction if you have LSD...