Looking on RockAuto and see a big price differential on replacement ball joints. Would you pay up for ACDelco vs Mevotech or Moog? Also noticed the ACDelco does not have a zirk shown like the others so I assume its a sealed unit which could be helpful. I have 163k miles on the originals and planning to change out the upper control arm and lower bracket soon....should probably do the ball joints too. A qualified mechanic friend of my son's has a lift and will do the work.