Synergy Jeep JK Dana 30 Inner Axle Sleeve Kit Designed to increase the strength of the Front D30/44 Axle housing that is prone to bending when larger off road tire are installed and used off roadDetails: Fits 07-18 Jeep Wrangler JK and Jeep Wrangler Unlimited JKMade from 2.0X.250 1026 DOM Tubing (1.50 inch ID), Machined OD to fit snugly into the stock axle housingInner Axle Sleeves add a 59 percent increase in strength over stockThe stock axle housing must be drilled and plug welding for installationBare Machined Steel Finish