Obviously, a n00b question, but what role do they play in the suspension of my TJ? I know there are "upper" and "lower" control arms, as well.
What's the difference between the two? Upper and lower what?
Please be patient with me. I'm learning one part at a time, lol.
And one more question, why should I replace them with a suspension upgrade?
Thank you guys and gals and keep up the good work!