So far on my RCSB 4wd, I lowered the rear by taking out the blocks, and adding drop shackles for a total of about 3 maybe 4 inches. The front was lowered with keys for about a 2.5-3 inch drop.
Ive been wanting to lower it more this winter while its off the road, and decided Im going to replace the spindles and hangers next.
But I wanted to know, those members who replaced there hangers, did you get one type of hanger, or did you have to choose from different sets? I found that there isn't just one type of hanger, there are 3 or 4 different configurations.

Heres a link to the info I found for my 4wd.
http://www.djmsuspension.com/Articles/HowsitHangin.htm

I'll get under the truck to take a pic, but none of these hangers resemble exactly what I have.

 

Not sure, but your link is messed up.