Put a set of Warns in my dad's truck,instructions indicated to install them as they came out of the box.After 6 months the hubs wouldn't engage,took them off the truck,they fell apart due to excessive wear.They were warrentied and when I got the new ones,I took them apart.Low and behold there was only one small dab of grease in them,needless to say,I applied a healthy dose of grease to each locking hub.Take them back off and add grease.