At the tail end of your driveshaft is a steel coupler (pictured).
It slides halfway on your driveshaft and halfway on the on the input shaft of your transmission.
Then there are two coiled steel pins (called spirol pins and also pictured) that are driven through holes in the coupler, driveshaft, and input shaft.
The spirol pins keep the coupler in place and transfer the driveshaft rotation to the input shaft.
It is very common for the spirol pins to shear off and then the driveshaft or input shaft just spin around inside the coupler.
That's where I'd look first.
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