The spirol pins (what should be installed there, and not split roll pins) may look good and still be visible on either or even both sides of the coupler but still be broken internally, with one or both ends you may be able to see still stuck in the coupler.
I suggest you hold the coupler tight w/pliers and and try to spin the driveshaft while doing so with another pair of pliers or vise grips.
I have seen this issue before an 882 diesel which are hard on pins.
Both ends still in the coupler but the hydro input shaft not turning.
And when driving the old pin out, what's left of it comes out in pieces.
It may be tough lining up the coupler with the hole in the driveshaft when installing a new spirol pin, use a short length of 1/4" bolt shank to line the holes up and drive the new pin in while pushing the piece of bolt out the other side.
Good luck!
NOTE TO SELF: replace the pins in the 882 BEFORE heading to Bluneirs plow day in October!!
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