Transmission won't release drive shaft.

[veinbar]

I've dropped the rear and mid sections of my drive shaft, and now I'd like to pull it out of my transmission. I've performed this on a few vehicles, but I've never come across one that didn't slide out. The drive shaft is stuck in the transmission. It's a th400 in a '79 silverado. Ive pulled,twisted and turned, and delicately tried prying it free. I'm open to tips and suggestions. Thank you in advance.
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