Yea, Weasel is right there. He sent me all the correct angles on getting it right on the rear too. The best bet would be to cut off the old perches and weld up new ones instead of a Tmaster type flip/bolt on deal. There is a bulletproof(if there is such a thing) set of instructions on how to make your own here and pics too. Okay, one of you guys repost this for me to clicky, clicky please. But here it is.
And attached is a picture of Mark Hall's Bad-Bowtie rear springs done this way as well as his self made add a leaf deal for 4 more inches of lift too. And by the way this will cure the spring wrap up. Also, Superlift has a Add a leaf that goes between the eye spring and 2nd spring for 2-3" and is real thick like my ZR2 springs. If you hung this in there all the spring wrap up would go away. Throw those lift shackles in the trash because you would be killing 2 birds with one stone. Ask me and I've done the research on what these guys have done for us already. If I had the money I would have one fire breathing machine by doing what the guys before us have done all in one stroke of the checkbook. HA HA Tom http://www.off-road.com/chevy/tech/perch/