Hotchkis 11390U Tubular Upper Control Arms, 67-72 C-10 - Manual (Page 4)

Once the ball joint is loose from the spindle, support the lower control arm with a floor jack and raise
the suspension slightly to relieve the pressure on the castle nut. Remove the castle nut and lower the
floor jack until the upper ball joint stud comes out of the spindle. You may want to use bungee cords
to hold the spindle assembly close to the frame rails as to not stretch/damage the brake lines.
4
Disconnect the Upper A-Arm Cross shaft