This steering is by far the worst thing about the design, but not much could have been done with these small things I guess. It has major bump steer.
A servo horn comes out of a chassis on the left side. a paperclip-like metal rod (which binds while suspension is working) attaches from it to a lever on top of the right side of the axle housing. It in turn is loosely attached to a plastic arm (behind the axle) that is connected to both steering knuckles.
This doesn't seem like a good description... I might be able to show pics later tonight.
EDIT: better yet,
here is a forum that if you seach through you'll find a lot of good info and pics of modded SSMT143's.