here is a post that i asked aboust the same thing and chevy-mike explains a little more on how to do it...make sure you pre lube the insides of the nuts with grease makes it alot easier threading them on....I did mine on my truck not to bad but would be alot eaiser off the truck....heres the thread:
http://67-72chevytrucks.com/vboard/s...d.php?t=508095