2nd picture measurement is from center of U joint on both ends. 3rd is end to end.
I hope it helps, I will keep it on the bench if you need anything else.
The 52 1/2 is perfect, and the 25 spline is spot on, if it will fit in a 727 tranny we're cooking. I'll measure mine overall as well. I currently have a 54" c/c.
