It's not wheel balance.

To check the ball joint, have the car jacked up from the subframe or unibody or whatever just not from the suspension/lca. Grab the tire top and bottom and shake it, if you feel a looseness in it it's usually a ball joint (although if your axle nut is loose it will do this too so check that first if it's a new axle and somebody just had that nut off.)

Grabbing the tire on the sides and it being loose indicates worn tie rods.