This video covers how to install an add a leaf to a typical spring pack. It includes other tips and tricks along the way.
The before and after measurements from floor to fender lip on this 83 RamCharger are as follows.
Before
LF: 34.75" RF: 35.325"
LR: 35.25" RR: 36"
After: With 5/8" Shim in LF spring pack and sway bar unhooked.
LF: 37.625" RF:37.5"
LR: 38.5" RR: 38.25"