First, your Jeep is a TJ not a YJ so you should be posting in the forum thats located right above this one on the main page.
But to answer your question: If you aren't concerned with the cost you may be safe fitting 35's to 37's underneath it (from what I've read elsewhere on the forum)
To be perfectly honest though, with a 4 cyl and that much lift I personally wouldn't go over 33's simply because you're already moving a lot of weight with a not so powerful engine. adding a couple inches to your tires will greatly affect the weight you're moving and will tank your gas mileage as well as put too much stress on your axles and tranny. This is all my humble opinion and you don't have to listen to a word I"m saying but I wouldn't want you losing a ton of money in the long run if you got the bigger tires without regearing and strengthening up all your steering components as well as your transmission. Just my .02
But to each his own I suppose. Hope everything works out for you with this.