Once in place and with the weight of the vehicle on the springs, the ZJ coil added about 13⁄4 to 2 inches of lift over our tired stock TJ coils. The diameter of the ZJ coil wire is slightly thicker (the TJ coils are 0.48-inch, while the ZJ coils are 0.52-inch). This should cause the ZJ coils to have a higher spring rate, and the ride on the ZJ coils is a bit firmer than it was with our old TJ coils. The end result is that our TJ now sits more level, and the front bumpstops are not constantly bottoming while on the trail. We have more usable uptravel with impressive flex.