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There is no reason you couldn't remove the top of the transmission and with the engine idling see if when the transmission is in second or third if the countershaft gears and mainshaft gears are turning. If they are than the keys would be the logical problem. Just be mindful that even at idle...

I was thinking maybe the keys for the 2nd ~ 3rd synchronizer sleeve sheared so the sleeve just spins on the main shaft. Just a thought