I've done sas's on a bunch of s-10's from leaf springs to coil springs to coil overs. They are probably on of the easiest vehicles to do. The frame rails are wide and flat so they work with many different perch width axles if your doing leaf springs.
4wd and 2wd frames are different. The difference being that there is a large bulge in the front frame rail where the coil spring sits up inside it. This bulge makes it hard to fit a shock. There are ways around it, it'll just depend on how much work you're willing to do. One being to cut the outside of the area off and replace it with a flat piece of plate cut to the shape of the rail. The other is to mount the shock leaning to the rear at the top far enough back to clear it.
The kits like drkelly posted work well and are easy to install but like he said they usually end up making the truck sit a little high. I recently did a '92 std cab 2wd for a customer. It used a cleaned up dana 30 from a YJ. We started by using stock waggy front springs sprung over. The owner thought it sat a little too high for his 33's so we changed to 4" waggy springs sprung under. They lowered it down around 2".
S-10's use a standard Saginaw steering box so almost all XJ, TJ, YJ and MJ pitman arms will fit. You will definitely need to have your d44 knuckles machined and tapped for hi-steer, order arms and have steering built. With the right spring, shock, and steering setup these trucks drive and ride very nice.
