No ties to Dana, just got tired of having <IMG SRC="smilies/cool.gif" border="0"> as my picture.
Not sure exactly how to measure the splines, but they're square-cut. It's the standard GM truck input shaft if that helps.
Where can I find this 1350 yoke you speak of?
Is something smaller available? It will be behind a small 4 cylinder manual trans (about 3.5:1 first).