The Barnes 4WD Rear Spring relocation Kit can be used on either a TJ or LJ. This kit can be used to locate the upper coil spring in a vertical position or works great when stretching your wheel base. You can still use your factory or aftermarket bump stops with this kit. Welding and cutting will be needed. Like all of our products this kit is laser cut and made in the USA. Kit includes parts for both rear springs! The rear frame side factory track bar bracket will need to be modified or replaced after installation. This is a good opportunity to upgrade to part number B4W250386.