I had the warn autos first after my vacs went out. Which i think were allready bad when i got it from the dealership. They worked great for the first sommer, but as i got more ballsy, they started to fail. They rely on a cam fixed to wheel hub, and when the axle spins forward, or back, the outer hub cam nubs spin against the inner, forcing the outer outward to lock the hub. I think nylon, and pot mettle. Go with the manual. Also very fun if you want to prove how far you can go in two low. <img src="/forums/images/graemlins/smile.gif" alt="" />

2001 Sportage, 4" RSG lift, Cragers W/31 10.5 Micky Claws, Warn Manual Hubs, 16 gallon Pro Street Fuel Cell, Custom Snorkel, K&N Filter.
1989 Dodge W250.