Just posting to make sure you're aware that YJ front springs are wider than CJ front springs. So when you wwitch over to YJ springs, you'll need to get wider spring mounts for the rear of the front springs, wider shackle mounts for the front of the springs, and wider shackles. You'll also need to get wider spring mounts for the axles, etc.

Having to change all that, you might want to consider converting your front spring system to a rear-shackle system at the same time, since you'll be doing most of the labor anyway.

1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.