Transmission drive shaft problem?

Guys this has me a bit confused.

I reinstalled my original 170 motor back in my 64 van. I had removed my tranny for ease of installation. I find it easier to drop the motor in with the trans attached.

I'm using the OG tranny that I've always had, but all of a sudden my drive shaft is to short! What the hell is going on. Did my trans yoke get pushed in? I'm about 1" short. The motor is on the mounts and the trans bolted where it belongs.

The van is in neutral and the yoke turns freely its just not out far enough to attach the drive shaft.

I've changed nothing simply removed it to switch motors and dropped it back in. No mods at all.

Any clue on what the hell happened?

I know its the yoke. For what ever reason it's stuck in the trans. going to try some gentle force to see if I can get it to move

Got it fixed. Learn something new everyday I get underneath this van.

I thought this entire time the yoke was a slip yoke. Its is not. The damn drive shaft flexes at the end like a shock. Simply had to pull on it and presto it fit.

I've had a few cars and this was a first without a slip yoke. Figured it out with the help of my neighbor.

Happy to here you got it figured out. There's nothing worse then something not fitting, or your buddy says.."where does this bolt go"...right after you put all the tools away...lol.