64 Dart Gt 4 speed won’t shift into gear ??

Killer6 said
Not yelling, emphasizing what the OP needs to stay focused on.

All caps is yelling. Not sure why you think it isnt.

Killer6 said
If You'd have read all 70+ posts, You'd know the OP stated it starts & idles fine in neutral, but unable to get it into gear once running, it's not trying to move in neutral & it's not in 2 gears at once...that is all. I know a number of guys who "oughta know" the torque converter isn't fully engaged over the pump gear lugs, but pulled the trans in with the screws anyways & trashed the pump...a couple of 'em.... so it certainly can't be ruled out the pilot is tight.

If there weren't issues on install I still have doubts that the pilot is too tight. If it is, it's a conclusiom to reach by order of elimination to get to that conclusion. Not assume it's all bad and pull the Trans to check.

Killer6 said
We have told the OP a couple of ways to check the release, & look for issues, as toolman mike said He needs a handy assistant.

This was my point that it needed to be done. Yet, None of the three points you had in all caps re iterated to check that it is releasing or not. Troubleshoot it first.

Why pull the Trans when you don't know it needs to be done yet without first confirming the linkage is working, or not. Can't troubleshoot linkage issues with the transmission on the ground.

These early As have issues like this. Torque shafts weren't as strong. Welds break, some crack. Clutch forks wear out. Pivot brackets crack. Ball stud brackets crack. Ball studs wear out.

Every item circled has gone bad and needed to be replaced on my early A in the last 15 years. Most except for the boot effect the symptoms described by the OP.