Alright, I will attempt to be clear:
The stock track bar isn't there just for axle wrap, a traction bar is designed to prevent this, in a stock situation the track bar helps prevent wrap simply due to it's placement over top of the axle. ie: the axle can only rotate as far as the bushing/jj/heim will allow and then it will end up breaking something or bending something or it will just stop.
That being said, pending how heavy your springs are it might make a difference it might not. If you have the right aftermarket track bar even in a YJ it feels less squirrely on the road. I will admit to not running one after I lifted my jeep, I DID end up putting wrap in one of my leafs and bent it permanently.
Dave - As per the YJ, it's long gone. Going to the dealership tuesday to order an unlimited rubi :lol: Finally have time to wheel again (maybe, we'll see)