The 35 is stronger then its given credit for,I've seen v8 ZJs locked on 35" tires thrash on them.
So depending on where and how you wheel you might be fine with the stock axle for now.
When I swap out my 35 I'm probably gonna do a MJ or XJ 44,maybe a late 8.25,I'm a Ford guy but I would not do a 8.8". Its a great axle but I can't give up the width,IMO the stock axle should be wider so I couldn't go narrower.