Replace those old, weak, factory shackles and get a little lift at the same time. This slightly-longer-than-stock shackle will help your springs really flex to their full potential travel, while the shackle's beefy construction will reduce side to side movement. These shackles provide 1" lift height in the YJ model Wrangler, while they give the CJ 5 and CJ 7 Jeep models a modest 1 1/2" of lift in the rear only.