You don't want to hear my opinion
Most people are referring to the '79-88 springs when they do a RUF (rears up front). Read the entire RUF thread on Pirate and you'll know the difference by the end. The 89-95 springs are longer and flexier.
How are you planning on doing your SAS? Are you eyeballing the dimensions, or are you copying what someone else did, or are you having a shop do it for you?
not what you want to hear, but you're my friend and I want to help.
In my opinion, you should keep your IFS. A sas is only going to make it less stable on the freeway and more top-heavy. It won't be very comfortable to drive on long trips.
Typically, there are only 2 reasons that people do a solid axle up front:
1) Solid axles are usually stronger than IFS
2) They articulate better than IFS
Please don't take any offense, but for a rig that isn't going to get wheeled, it makes zero sense to do a sas, especially with a sami axle. If you plan on rock crawling hardcore trails, it might make sense. A sami axle isn't going to be much stronger than your IFS right now. If you want it for the looks and bragging rights of a sas, then I suppose a Sami axle could work, but if you actually plan to put it into 4wd, I strongly recommend against it. Talk to Mark @ Low Range and see how much he loves his sami axle up front.
I hope this post doesn't come across as harsh, I'm only trying to help save you some heartache and $ from lessons I've learned the hard way. A sami axle is 4" narrower than the stock IFS on a tracker. You'd have to use 2" wheel spacers, and while that's possible, it's not the right way to do it. Even a toyota axle is still 2" narrower than stock. I wouldn't even consider a SAS unless you're going with a toyota axle. And even then, unless you're doing some really tough rock crawling, I'd stick with IFS on that rig. If you don't plan on doing anything tougher than rattlesnake or hell's revenge, definitely stick with IFS.
Now if you're going for show and bragging rights, then I don't really know what to suggest.
