This is the ultimate upgrade for your Premium Warn Locking Hub Kit. If you want to run lockouts but also want the strength of a slug this is the product for you. The Locking Hub 300M Gear Upgrade is completely made from 300M alloy steel, and replaces the Dana 44 stock hub gear for increased torsional strength. Easy installation and warranted against breakage. If you are running our outers with the Premium Warn Locking Hub Kit we recommend this gear to minimize the possibility of failure. Backed by our "No Questions Asked Limited Lifetime Warranty".*Sold Individually See Application Chart:http://www.warn.com:80/truck/hubs/premium_application_chart.jsp