Missing cap?

[Epplers]

Is there supposed to be a cover for this hole in my transmission

 

[wjburken]

Is there supposed to be a cover for this hole in my transmission

That is an inspection hole and yes, there should be a metal cap/plug there.
GM Genuine Parts 24205900 Transmission Bell Housing Inspection Cover (62 mm) https://a.co/d/1YOxm9J

 

[Epplers]

Thank you
I assume I shouldn't drive without it.

 

[wjburken]

Thank you
I assume I shouldn't drive without it.

It’s a dust cover, more than anything. You should be good.