Kirk, I'm glad you're doing all of these upgrades to your YJ so I have someone to help me if I decide to do this to my XJ. I have the same D30 with vacuum disconnect. If I decide to put money into my XJ I need the rear axle replaced, SYE installed, new rear driveshaft and then go to the front axle. Although, I think my engine will quit before I get to that point. My XJ is at a crossroads with dumping money into it or just running it into the ground with the intention of buying something else.