Yes YJ springs are very long and very, very soft, but require a lot of work to get under a zuk (YJ's are 2.5" wide, Zuk is 2", CJ front springs are 2"). The CJ's are not as stiff as you think and gave me 2" more wheel travel, I can pick one tire up 24" now, with the same setup, just stock rear springs gave me 22". Also it moves the rear axle back 1 1/2", longer wheelbase helps ride.I am eventually exo caging, but the zuk is as high as i want it, but want 34x9.50's under it, no fenders= no fender rub. Next is my rear upper shock mounts then modify the stock rear spring pack to put under the fron, it's close to 3" longer than the fronts.