What do I have to disconnect or remove to install a new axle? Old axle is not on vehicle and all front suspension is intact

Separate ball joint from the lower control arm (LCA), pry LCA down, and install new axle. There is likely a Torx thru-bolt that needs to be removed from the ball joint, in order to separate it from the LCA. Spray the ball joint with penetrating oil and use a stout pry bar to separate the ball joint from the LCA.