Here is a wartime version of the Thornton No Spin for Ford Cars. I see that it also involves replacing the axles, while the modern version uses the original axles (or uprated aftermarket replacements made to the original form). That may be a peculiarity of fitting it to a Ford Banjo diff, or it could be the original design used for the No-Spin.
http://www.ebay.com/itm/NOS-Vintage-...dYoSmI&vxp=mtr
But I'm still (13 years later
) looking for an example of the Truck version that may have been fitted to a CMP.