[GTO-TT/Chev57]

Hi, It's nicer to undo the top bolts if the trans hanging down at the back. Put a jack under trans and undo the rear crossmember will be better with exhaust and drive shaft off, hope you still got the engine mounts done up.
Slowly bring the trans down just enough to get a long extension and socket on them, and then lift the trans back up and bolt up. Use a small jack to support the front of the trans while you take the motor out, make sure when you lift the motor to clear the mounts you keep the jack touching the trans. Is it auto or manual.