lowering springs on lowering struts
 

has anyone else tried to install a 2" spring on the belltech 3" struts?

The only issue I can think you'd have would be alignment. You can check with SPC for alignment bushings.

I did on the GF truck a few years back and when you jack the truck up the spring doesn't sit in the rubber bushing anymore but that nothing major and we also had one leak but I think it was a bad weld because the otherside is still good. Truck needed a few modifications to get the alignment done

You are looking at a lot of modifications to be able to align. I wish it was this easy to drop the truck 5inches
I'm doing control arms,struts and spindles to get my desired 6" inch drop
Good luck on the build bro

5" dropped in front: permanent rubbing on top of inner fender wheel.

that would be the case on my fx2 anyways.
I'm 3/5 droppes and only have about 2 1/4 " left between tire and inner fender (even with the liner removed)