[Tom Kirkham]

Original Cobras had 19 spline axles.
Lots of 19 spline axles have broken.
If you are lucky the axle will have a ductile failure and just grind itself down.
If you are unlucky and have brittle failure the break will be a spiral and wedge the case apart. Remember, today's Cobras make more power, and have a lot more grip. The 19 spline axle is the weak link in the chain.

Most of the Shelby Team cars had diff coolers.

How can a limited slip be consistent, if the temperature is varying?

I am not saying you need a diff cooler for the street. Just that the mods are easy to do now and you can plug the holes. That way in the future, if you change your mind you can just remove the plugs and install the cooler.