904 and stall converter q's

Here are pics of the tail end of the tranny, and the front end of the driveshaft. There's a "governor" just ahead of the crossmember, I believe it's to engage the park pawl?

I'm running a 1964 pushbutton trans and it looks like yours. Like the other guys said it should have been a slip yoke pushbutton trans, but maybe your Dart was a early model year and they used a left over trans from 64 or someone else replaced it. On the convertor I had to change the input shaft to run a newer style convertor. The spline was different. Now maybe someone did that already but you might want to verify if you take it apart. I have the same driveshaft like you are running. Looks like yours broke and somebody rewelded it on right before the large dia of the tube or is that grease? Goodluck. Jysnflem

Test and Tune.jpg