2004 honda civic starts, but wont drive?

Car was in a wreck, but still ran and drove. I was fixing some motor mounts so i jacked up the auto trans. And the motor. After changing them and putting car back together, i started up the car, put it in drive, and it wouldnt move. Same with reverse. It was just running 2 weeks ago when i backed it into my garage. No leaking trans. Oil. So i have no idea what it could be. Anyone know if something might have broken off to cause this? Any help would be appreciated! Thanks!

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