I have a 4" rancho on my 02' Gmc, it actually measures 5" on the drop bracket's. I use it on my pulling truck so I can run 315/70/17 and level my cv shafts.
Here's a good deal if you have the money now!
http://creaturesofthenightperformance.com/Engine-Performance-Package-2-Carrillo-RodsMaster-Headgasket-Set-H-Series-Bearings-FREE-HOODIE-P3579197.aspx