I had mine converted to 12.5:1 and love it. With all the suspension upgrades it drives like a newer car. The conversion was pricey, but you can use a box from a 93-98 or 99 Jeep Grand Cherokee. It's a complete bolt in from what I've read except that you need to get some inexpensive flare adapters. The SAE hose fitting threads even match the metric threads. The Jeep box will give you 12.5:1 with stops that are better matched to the FGF than like boxes from other GMs.