Yeah, but it looks to me he does`nt have any linkage hooked up, plus I dont see a drag link. Maybe it`s just out of view. Cross steer seems to be the way to go, to rid the dreaded bumpsteer.
There's a dart altered build somewhere on the site here, he used the A-100 axle, I checked his build out, can't remember exactly how I found it, you might search dart altered, I think he was talking about the same bumpsteer problem that you are, if you can find it, it might answer your questions and concerns....