[Yukon Jack]

At least with the 67-72's 4" and less lift springs generally don't need an angled shim.

Does your front driveshaft have a CV-Joint? I had to add one to my 69's front driveshaft when I did an initial 4" lift, I think maybe related to having the Rockwell transfer case.

Hopefully someone who know about front end issues will chime in, if not, I'd say you ought to run up to an alignment shop and see if you could talk to a tech about it.

Dropping the tranfer case crossmember could be an option to stop the rubbing. Do you by chance have new mounts in place - if not your old ones might be in bad shape causing part of the rubbing issue.