[Chris]

Originally Posted by rotorwrench

I found this on Google. http://www.hemmings.com/magazine/hmn...s/3709971.html
It indicates that the late 55 thru 56 used the 28 spline. You may have a later axle or perhaps the third member & axles were changed somewhere in its history. There are also some differences in the Canadian stuff but that is getting into unknown territory.

Thanks, that is an eye opening read