This is a short very informative video that Limey57 posted in the general discusion area. I'm just reposting the link here in the Tech Link section. Thanks again, Gary.
"The video is only just over 2 1/2 minutes long but manages to explain things better than endless conversations or paragraphs in a book could ever do! I knew the basics but after watching that it really brings home the importance of phasing driveshafts. I guess a lot of folks on here know this, but for those that don't:"
http://www.macsmotorcitygarage.com/2014/07/26/video-driveshaft-angle-and-phasing/