@curtbernard755 Control arms should be tightened in the position they will be at when the vehicle is on the ground. Known as ride height. The rubber bushings allow a certain amount of movement up and down. Ride height should be the center of that movement. The bushing will then be under no tension except for when a bump is hit. If it isn't, the rubber will be stretched at all times, and bumps will cause more stretching. The rubber will eventually tear.
