[ktbro]

When install new rear upper control arm do I need to separate the new ball join.
Does the ball just bolts to the knuckle or does it have to press in also.

 

[3g Legend]

bang on the knuckle that the balljoint is in and the distortion of the material after you give it a good wack will free it from the knuckle. It's a tapered seat just like all the other balljoints/tie rod ends on the car.