If your runner is already sagging and you install the same size lift front and back, you'll still be sitting low in the rear ......just higher overall.
I went with a 1" front daystar spacer and 2.5 ez-lift spacers in the rear. The truck has a nice stance with the rear slightly higher. The 1" spacer lifted way over an inch . And since the rear is up slightly higher, i only need to inflate my airlift bags to 15 psi to hold a load.
A nice cushy ride. Kenny S>