Alright alright... got it figured out today and it is a decision that will make everyone on here happy including myself.
But first... to answer some questions and explain some of my previous decisions. First of all: Glenn. I ran the springs in the stock mounting location because the stock frame isn't strong enough to have the extra leverage and side loading caused by the side mounted spring mounts. I saw a guy at Tellico who did this on a willys, and his frame was always cracking and breaking around the mounts, and they were well gusseted too... This made me glad I left the spring location alone. You see, a Willys frame is striaght all the way back... it never kicks out like the AMC era CJ frames do. Even the later CJs have the springs directly under the frame to prevent the side loading, but since the frame is wider at the back, the springs are too. As far as the transer case goes; I kept it b/c I was 14 when I started on this thing, and I had very little money. It was cheaper to keep the T90 and the 18 and run that behind the 4.3 than it was to swap the trans and t case out. Actually, I have been very satisfied with the T-case. If it weren't for an out of adjustment shift fork, it would've never broken. But I didn't catch it when I re-built it a few months ago. Until that point, I had been wheeling it hard with it badly worn out (as in outputs were able to move around 1/4" in any direction... seriously) and never had any problems out of it. I also like the gear driven design, twin sticks, 2 low option, and having both pumkins offset b/c it can help while navigating through the rocks. I know you can do twin sticks and 2 low on other cases, but it costs money. With an 18, its free if you know what you are doing.
Also... Rick Pewe (yes, the same guy as in your sig Glenn) clearly justtified it to be the "Best Transfer Case Ever" lol. (Only kidding here, that has nothing to do with it).
Now Doug: I Cannot truss the axle on top due to the pass spring being mounted literally on the cast. The is no where to put a tube, unless you ran over the springs, which I won't do b/c it will limit up-travel quite a bit. And while I
could put a truss on the bottom, I won't do that either b/c then I have no ground clearance.
So the solution is as follows:
I found out that the pre 77 F-250 housings also had the beefy castings and 1/2" tubes, but they were low pinion. So I made a phone call and found one. A bare housing for $75. Im gonna grab it next week. I'll get the tough as nails factory housing that I need with the already cast in spring perch on the correct side, and I will be able to use all of my internals. So... basically for $75 plus gear oil and some time designing more brackets and putting it together, I will have another axle in and ready to roll.
Hows that sound bitches?
Seriously guys... thanks for the input. It definitely helped to sway me away from the HP. While I do think it'd be cool and different, I don't think that it would hold up to my abuse very long, even with the cryo treatment. While they would be under warranty, I don't want to have to swap them out after every other trip, so I'll just keep the low pinion since I have had really good luck with them. And its cheaper this way too!