The problem could be the control arm bushings. Make sure you get quality replacement control arms. There are some cheaper ones out there that will last less than half as long as OE and can have more severe pulling problems when they start to fail. I replaced my front struts a couple years ago and de...

Oh man! I just wrote all the stuff below because I was stuck on the question about replacing the spring. You mention being able to spin the strut mount cap. If the noise is a clunk or rattle then I bet the problem is loose hardware at the top of the strut or your upper spring seat is shot. My wager ...