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There is a drain plug under there so the DIY folks could change it themselves.
GM is big on filters and the transmission filter should be changed as well.
That means dropping the pan on the tranny. Major mess time.
The last time I changed the fluid on a GM, I used Mobil -1 t fluid and it worked very well.
The newer GM specs call for Dex IV (Dex 6) which is a 'blend' much like Dexos 1 engine oil is.
The transmission gasket is re-useable, so remove carefully, it's not cheap.
My 2¢
GM is big on filters and the transmission filter should be changed as well.
That means dropping the pan on the tranny. Major mess time.
The last time I changed the fluid on a GM, I used Mobil -1 t fluid and it worked very well.
The newer GM specs call for Dex IV (Dex 6) which is a 'blend' much like Dexos 1 engine oil is.
The transmission gasket is re-useable, so remove carefully, it's not cheap.
My 2¢