Are you going to narrow to CJ width or stay longer? Biggest difference (aside from WMS-WMS size) would probably be the front axle caster angle. Scout axle would be best to rotate the "C"s a little to have better steering manners.
I've spent some time researching the same idea, I also would like to go wider. I'm just going to go with a new bear front housing from Custom Axle Design to my specs and build it up myself. For the rear, I'll just cut another ford 9 inch down.
I have looked at the currie housing... Currie used to make a high pinion 9 inch 3rd member; but stopped about 2 years ago. I talked to the Currie folks on the phone and it sounds like there were having a higher failure rate than they were willing to accept. There appears to be only one other company that makes a high 9 3rd member; and they are 3k by the time you have gears.
My two thoughts on those axles for sale is that the welding on the Cs on the front looks a bit rough (like something I would do ) with a lot of grinding. The front is clearly not ready to bolt in as someone went in and cut off the perches, so these weren't just pulled out from under a Scrambler and put up for sale.
I also got burned once on a purchase where "full Detroits" ended up being a pair of lunchbox lockers because I was too trusting and didn't pull the diff covers myself before I hauled them home. So I'd want to see something to prove what's inside.
I’m going to let the 9” pass. I found a set of Scott ii 44’s. I’m trying to get more info from the seller, as from the pic, it looks like a drivers side drop, but I thought Scout ii 44’s were passenger drop? Here’s a link. Let me know what y’all think. Anythingi should be looking out for? I’ll post more pics as I get them