The top will fit but you'll run into problems with the tailgate and the tire carrier. With a CJ you'd open the tire carrier then lift the door on the hard top to get in the back. A YJ has the tire carrier bolted to the tailgate so you'd need to open the door on the hard top slightly then open the tailgate on the YJ to get in the back. You can't just open the door on the hard top because it will hit the spare tire on a YJ.
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Jon B.
'82 CJ7 Some mods.