If the vehicle isn't going to be used for any serious off-roading, I'd look into the clutch-based LSDs for the rear at a minimum... and the front if you want to get a little more grip in 4wd. Everet said there's a guy that posts over on the other KIA forums that can get good prices on dealer parts. I think that would be a good place to start.

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1997 Sportage 4x4, auto-trans, Warn manual hubs, 4" UPYOURKIA front lift, TJ 106AA rear springs, 2-5/8" body lift, 31x10.50 treads, SmittyBilt SRC front and XRC rear bumper, swing-out tire mount, OBX LSD front diff, Track Finder rear locker, 5.38 R&Ps and... really crappy gas mileage! <img src="/forums/images/graemlins/shiner.gif" alt="" />