I believe there are only 2 or 3 lift kits available for the G1. From what I've read and looked at, the Jake's 6" is the best quality as it comes with new A-arms for up front. The 4" kits just lower all suspension mounting points.
The front of the Jake's 6" also allows you to change where the top of the shock mount bolts in, giving you some adjustment up front.
I like the kit, but in the end it's all about what your needs are
