you won't see a bad ball joint from turning the wheel back and forth. Thats how you check tie roads and steering components. The weight of the jeep is on the bal joints, You need to jack it up from and support it from the axle. But pushing it by hand is not sufficient, but it will work if they are absolutely wasted. Like I said b4, Use a pry bar also. You will be surprised how much more efficient it is.
02 Grand Cherokee Limited, 4.7L. Bone Stock Family Truckster.
2" Rough Country BB, 255/70/17 Grabber AT2's