I ran 32's on my '86 CJ-7 (you might want to include more info about your rig and intended usage, you'll get better answers) with a 2.5" Superlift and another 1/2" of lift from some Tomken shackles (most standard heavy duty replacement shackles are an inch longer than stock and will therefore give you a 1/2" of lift...I don't recommend much more than this in shackle lift) teamed with Rancho RS9000's for several years as a daily driver and moderate off-roader. For 33's, I'd add a 1" body lift. You'll also want to regear your axles to keep your performance up. Old Man Emu is arguably the best off the shelf lift for YJ's...adapting to a CJ is a fairly simple matter...there's nothing to trust or distrust about the conversion kit other than the price. The Rubicon Express Extreme Duty (*not* the standard duty) is probably the second best for YJ's and best for CJ's off the shelf and also offers a 4.5" version which Old Man Emu doesn't match. This is *also* a YJ kit...the CJ version just comes with the conversion parts. As far as the conversion, the rear is a direct bolt on. Up front you either use conversion shackle hangers and wider shackles or conversion shackles (this is the route RE uses...the top part of the shackle is the same size as stock to fit the stock shackle hanger, the bottom part is wider to fit the YJ springs). Beyond that, it's just new spring plates for the front with wider spaced holes.
'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff.
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