Not sure if it would apply to your guy's Sportages, but the Sorentos have a label above the pumpkin on the rear that indicated if it is "LSD" or not, also gives the ratio (either 3.333 or 4.666 on our Kia 10 bolts)

http://www.bit4net.com/images/sorento/rear-axle/P1020677.jpg


2005 Kia Sorento LX - 3.5L with 5 speed manual
2" Daystar spring spacer lift - 265/75R16 BFG's fitted
Custom front bumper with hitch mount, sliders, engine skid.