PICTURES ADDED>>>So I have a couple of columns i got at swap meets. They look like 55-57 to me but question. I pulled the actual steering shaft out of the automatic column and it measures 33.5" long. The bottom end has a female splined end. I tried to put a 3/4 30 male splined end in and it is just a hair to big. I thought it might be 9/16 30 but that is much too small. Can anyone tell me what size the splines are in the bottom of that column? It is a possibility that it may be a 3/4 30 female. If so i was looking for a 3/4 30 spline steering shaft and not having luck...Anyone? Working on my hot rod and as we all know nothing is ever stock.