Trans doesn't go in gear. Now what?! Please Help

So tonight, I plan on making sure the pump is pumping in gear. If that's the case, It's likely that the input shaft splines are the issue.

Since I know the converter is for a 24 spline shaft, I'm going to see if I can count the splines on the old converter (since I know it worked). If not, I guess I've gotta pull the trans. Damn...