Transmission wont shift Into third or drive

Hello, I'm not sure how the carrier bearing and radiator has anything to do with the transmission shifting, honestly. Nothing should have changed in that respect related to replacing those components. A diagnostic tool will be needed to see what gear is being selected and see what the transmission is doing as a result of the settings chosen.

Bled air out of transmission fluid (?) ... Check transmission fluid level.. Other than that - seek hands-on assistance from qualified personnel.