Rag joint rebuild kits. I'm not sure if they fit 99 sub.
http://www.summitracing.com/search/p...lacement-discs
Here's a mod to get rid of the rag joint. Not sure if it works with speed sensitive steering though.
http://67-72chevytrucks.com/vboard/s...d.php?t=584641
That's about the best i can do. Hopes this helps.