Yes, it sounds like it would be a good idea to pull the hub and check out the innards. Might just need a good clean and lube. The manual hubs are pretty simple and easy to work on. They're also quite bullet proof. So I'm betting they just need a good clean out and repack with fresh grease (do both, just for good measure).

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="" />