Hello, I'm restoring a kit car that has a fairly standard Cortina rear end with an Atlas axle.
It has the wobbly four link with the upper arms making a "V" shape.
I'm thinking I'd like to tighten up the side to side movement.
I assume a panhard rod is a no go as it will have a defined arc side to side movement that may not "agree" with the upper arms. Am I over thinking this?

Would Watts linkage work?
Would I need to modify the original four links with watts or can they stay as is?
Assume they wouldn't all need to be parallel with eachother?

Any help would be greatly appreciated.

 

Panhard is a cheap and cheerful fix if you don't want to rebuild the rear, make it adjustable so it can be set after install.
It's used by Ford on 2005 to 2014 Mustangs, non adjust as they already know the correct standard length.

 

I can't see the upper arms in that image. Do they resist sidewards movement?

My fear of putting a panhard on a Corrina setup is that the upper arms are trying to resist sidewards movement (albeit badly) and the panhard forces sidewards movement with a great deal of force.

Maybe the bushes could handle this?
Or maybe they will disintegrate, or worse, bend something.

 

Just a single centre mount.
Top of the diff is on the right.

 

Ah, I see, that makes more sense.
So your three links are all parallel so running a panhard is a good route as you can allow that side to side movement.
I wouldn't be able to bolt on a new links like you have as my body is GRP so would need to fabricate something bespoke to mount to the chassis.

Unless it's not a problem fitting a panhard to non parallel four link.