Should I replace both upper ball joints at the same time?
If one ball joint is worn out, chances are the ball joint on the opposite side is also bad or nearing the end of its service life. Many technicians recommend replacing both joints at the same time (both lowers, both uppers or all four). via
Can you drill a ball joint out?
One way to remove a ball joint rivet is to drill it out with an 8 mm drill bit and an electric or air drill. Having larger sizes is also useful since you may need to increase the drill bit size as the rivet is drilled out. A hammer and chisel is also needed to chisel out the rivet. via
How do you remove upper ball joints from knuckles? (video)
What is the torque spec for ball joints?
Many ball joints may have an initial torque spec as low as 15-30 ft/lbs and torque angles are between 140º and 225º. via