Yeah. I know its not gonna be cheap, but mind you I'm not doing a build like yours, my goal is to get it off the ground, and I've done my research and know exactly what needs to be done. Its not rocket science to tear Jeeps apart and build them. They are inherently very simplistic machines and are designed to be torn apart and built. Unfortunately the KK is the last of the solid axle off brand of the Jeep lineup we will ever see (JK aside) mind you the IFS up front, therefore I hope I can be the first to start a modest/affordable way to SFA these things. Its been done cheaply on KJ's, no need to spend tons of money to do it on a KK. The way you built your KJ is pretty awesome and nobody will disagree with that. You've got a stellar rig, but if I were to spend $26,000 on a rig, could you imagine what kind of JK you can build with that kind of money, buying a used JK to start with. It would be epic. When it comes to the 8.25, its not a bad axle, I pound the living daylights out of it on my XJ with 35's and it has never let me down. Lots of XJ guys will agree. You and I both know you cant drive to home depot without seeing a few xj's on 35's, and at lest a few thousand JK's on 35's or even more common these days 37's with the stock junk D30 and 44's and they do just fine (99% on stock gears). I wheel all the time with stock JK's on 35's and 37's and never had any failures. Not crazy wheeling but crazy enough that a u joint or shaft should go by now. My KK is a 6 speed also, 4:10's are good enough in my case.

BTW: you may already know, but Marlin over at JBA is in the process of creating a long travel setup for the KK that will accommodate 37's. He's supposedly gonna use an F9 diff, RCV shafts, and ORI struts. I would scrap the KK SFA swap in a heartbeat if this was gonna be affordable, however its probably not going to be if any of his other lifts have anything to say bout it. What he has in mind is gonna be epic and a game changer for the KK. I'm going to assume this kit will be in the $5-8K range. The price of a used KK these days.