I think you have a second gear planetary that has blown up inside the transmission, which is the only this that can stop the differential from turning. I would remove the transmission and have it rebuilt.
Here is a video to help you:
https://youtu.be/3vJAojsrfuU
Let us know what happens and please upload pictures or videos of the problem.
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Wednesday, November 9th, 2022 AT 11:19 AM