It could be your hubs, or it could be your axles from the sound of it. Take off your hubs and see what the end of the axle looks like. Sometimes with auto hubs the clip inside falls off and grinds the tip of the axle so that it won't grab.

Jay <img src="/forums/images/graemlins/mrt.gif" alt="" />

1989 Trooper 2.8 V6 5-Speed(the daily driver)- Superwinch Hubs, otherwise Stock - $350
1990 Trooper LS 2.8 V6 Auto - Superwinch Hubs, otherwise stock....for now - $182.50
1983 Chevy Blazer - Stock - $150
No Car Payments - PRICELESS