3 LINK REAR SETUP

No leaf springs left and to.import them will totally kill.my wallet. It's easier to get steel.cut and bent and welded here at the engineers I use.

So maybe the 4 link is right. No need for the panhard or watts link then.
I've always been cautious about the dreaded idea of "bind".
The art Morrison one is definitely the way to go. But...4 link?
no no, there's two types of 4 links. A trianulated 4 link, which does not use a panhard or watts, but its bind central and not recommend for articulation. The second is one like I'm running, which is a parallel 4 link with either a watts or a panhard bar.

Basically, a triangulated 4 link has the upper links angled inwards towards the center point of the car. A parallel 4 link, the upper links run parallel along the chassis. just as the lower links do. Which is why it requires a panhard or watts to keep the axle centered, left to right.