Thanks for the response Chris.  I have heard as well that some people omit the spot welding, which is one of the reasons I thought that JB Weld would hold the bushing well enough to prevent rotation.  $189 for a few bushings is a lot of money, and I have already purchased mine anyway.  They have lasted over 100,000 miles, so seems like a pretty good deal to me.  I would imagine if only part of the suspension is replaced with different quality materials that it could probably cause problems too.  Sounds like it's worth getting somebody to spot weld these in, but from the threads I've read that's where most people go wrong. They get overheated and destroy the bushing. Go Westy has a big writeup on this as well. http://www.gowesty.com/library_article.php?id=1144

Troy

  I had mine spot welded.  I later learned some don't bother spot welding the upper bushings and experience no bushing rotation, which tells me it can be omitted if you're adventurous.

  This time around I'm inclined to go with Powerflex (http://t3technique.com/powerflex-bushings.html) for front and rear bushings.  High-quality marine grease is recommended.