The hub locks may be stuck and unable to engage. That can happen if the grease is gunked up or gone. They are easy to disassemble. Just remove the 6 bolts (10 mm) and pull the locking mechanism to have a look inside. If I recall correctly, there's a flat snap-ring inside that retains the guts and spring. They are very simple. If the grease looks fouled (assuming it's still there), you might want to look at the hub and wheel bearings. Hope that helps... <img src="/forums/images/graemlins/kewl.gif" alt="" />

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="" />