Depends on how ambitious you want to be. I did my waggy swap last year, this winter I'm doing the SOA. If I'd know everything I know now, then I probably WOULD have done it all at once, seeing as you are going to have to relocate everything anyways, why not do it just once? However, if you think you might stay SUA, then you can take the project in smaller bites and then maybe you'll find you don't want to go SOA after all.
The biggest technical issue you'll face going SOA is what to do about steering. With the stock location tie rod on top of the knuckles, I've HEARD you CAN go SOA with the stock knuckles by making your spring perches about an inch higher than stock - again, this is what I HEARD. I was considering this, but the main thing is how do you get the drag link to connect? Try as I might I just couldn't see putting a Z link or other such on my rig, even though I KNOW many very knowledgable jeepers who have done so with good results. So me personally I decided if I was going to do this I would only do it with Hi Clearance steering, and have now gathered the stuff and I'm actually going to convert the steering, get that worked out, THEN do the SOA.
You WILL need an anti wrap bar, and that will go a long way to saving your springs. If you have a welder friend this is not hard - my friend made one in like 2 hours using tubing, plate, and left over shackles that looks and works very similar to Sam's - obviously not as beefy, but does the job amazingly well. Cost like 20$.
The thing I have heard consistently is to use 5 leaf (rear YJ) packs on all 4 corners, PLUS either a full length add a leaf OR a main leaf with the ends cut off from another pack, making it 6 leafs. The full length second main leaf apparently greatly reduces spring sag. I personally am doing that because the spring packs I scavenged off a YJ lifter already have a full length add a leaf. I MIGHT also do the second leaf above the main thing also, we'll have to see - that might lead to too much lift. I also plan on carrying a spare main leaf for when one breaks - Been there, done that, not fun.
Chad
Chad Lloyd 95 YJ 4.0 NP435 EBD20 woodies D44s 4.88 detroits SOA revolvers 35 X 15.5 SXs 8274