Hey welcome to the site!

Best sure fire way to tell if you have Quadra-Drive II (with locking axles) is to count the number of bolts on the rear diff... 10 = QuadraTrac II, 12 = QuadraDrive II.

Not sure how to tell the difference between a spec'd out Sport or a Limited... im guessing some of the trim may be different. Does it have chrome grab handles in the back? I think that was one of the differences (but not 100% sure).