If it fell out it may be the wrong bushing. Unfortunately the best way to do it right is remove the clutch and pressure plate and start over. Make sure you have the right bushing, check the fit over the tranny shaft and also in the crank hole. Too tight and it won't go together and too loose you will ruin something later and it will squeal like a stuck pig.

1953 Chevrolet 3600
Fried Green T'mater (Vern)
In the Stovebolt Gallery
Caution: Political Statement
Man who runs in front of car gets tired, man who runs behind car gets exhausted.