Another torque converter question

You can tell real easy if it's a lockup by looking at the end of input shaft. If the splines go to the end of the shaft it's not a lockup. If the end of the shaft is milled down smooth for the last 3/8~1/2" it is a lockup. Also you can count the splines and tell by that. The lockup trans. was a 23 spline and the non lockup was a 24 spline.