You are replacing the whole lower control arm correct? Which part of the control arm doesn't want to go on? I just replaced both ball joints with a subframe out... obviously much easier but still, try sliding the control arm onto the tension strut and then sliding the end of the control arm into the subframe. Not sure if you are having a problem getting that part on, or are you having a problem getting the ball joint to sit in the knuckle? If it's the knuckle take a pry bar and stick it between the bottom of th subframe and the top of the tension strut and push down. It should move the control arm down enough to swing the knuckle in place above it. Once the ball joint is in line with the knuckle slowly let pressure off the pry bar and give the bottom of the ball joint a slight tap with a hammer.
