The best tuning guide I have ever seen was done by Ron Paris. There was an archived PDF, but the site is down now. Here is the only version I could find. It is written out in several consecutive posts starting with post #5 of this thread:
http://www.beatyourtruck.com/forum/s...ead.php?t=9087
I have the original in PDF, but have no way to upload it to this site.