Problems with the box of an Optra 2007

When the car turns on, the transmission makes a noise as if it lacks oil but noticed that it does not bring bayonet to check the level and investigate and they told me that the box is sealed the transmission is automatic.

Hi Richiskate, the Chevrolet Optra 2007 is the Daewoo Evanda in other markets, although those boxes do not have barilla to measure the oil, it is verified by a Revose screw, similar to the mechanical boxes ...
The procedure is the following: Start, that the box oil takes temperature, then with the vehicle stopped, you pass all the marches, PRD21, waiting for a while between them, then stop the engine and let cool a little, so as not to burn and carefully take out the level verification screw, if it comes out a little, the level is ok

In any case, I recommend fixing well, in the sense that the sound comes from the automatic tranex, or on the other hand, noise and vibrations can spread ...
If you have doubts.