I tried 33-12.5 on my stock 84 cj7 and rubbed with 4 people in the Jeep on flat pavement. But it rubbed mostly on the drivers side, maybe I have the famous drivers side droop.
drivers side in stock form also has a steel plate between the spring perch and the spring. this is the bracket for the steering dampener. It's not much but an 1/8" is an 1/8" when things are that tight
I might be missing a few bolts, but how does the add a leaf work on the cj's with the springs under the axles? Just curious??
They have more arch than the stock leaves so when you add them to the spring packs, they change the arch and tend to stiffen up the ride a bit too; the full-length ones are better than the shorties that just get slapped onto the bottom of the pack.
'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. http://www.jeepskate.net
i had 32's on my 86 stock suspension with no rubbing. i threw some 33's on there for fun and had very minor rubbing. with the TJ flares i have now, i would have had no issues.
as far as the shackles, i say avoid anything over 1.5" lift shackles(give 3/4" of lift.) i have 1.5's on my 86 with a 4" suspension lift and it handles just fine on and off the road, even with 33" TSL's. i also know guys who have the monstrous 3" or larger shackles and have no problems. i think results vary from each individual jeep.
here are a few pics from '07 with 33's and stock suspension. now obviously your flex would be hindered, but with some TJ flares to open the wheel wells a little, you may not rub much at all, depending on the condition of your suspension.
For my current Jeep; I started with a, 85 Laredo, the largest tire that I could fit, on road with stock springs/suspension, was a no name 32 (note; most tires measure smaller than the sidewall designation). The 32s hit hard enough, off road, to bend sheet metal and chunk the tires and would rub, sometimes pretty hard, over speed bumps in town.
33s had no chance of not rubbing (use of a tape measure will verify this).
I would second those that say stay away from long shackles (its a noob mistake that is frequently repeated in spite of experienced advise).
The rear TJ flair retrofit is the only good solution that I have found (excessively high, excessively stiff (read poor) lifts, body lifts or ugly body butchery will work but I cannot, in good conscience, call them good) that allows the use of 33s and 35s with reasonable lifts. It is necessary for Jeep suspensions with good ride and decent articulation for lits in the 5"+ range to prevent metal and tire damage off road. (Off road use is the only reason to consider tires larger than stock, IMO).
Note; tires significantly larger than stock will require re-gearing the axles to maintain performance and mileage.
You need to be prepared for the effort and expense; Jeeps that perform well are neither cheap nor easy...
...a well prepped, well driven, vehicle should do well in any terrain, including the highway.
Carburetors became obsolete during the last century... do what ever it takes to get fuel injection...It makes bigger grins off road.