Question on Transmissions

[WalterNY]

I am interested in a bus. It is a 2006 Blue Bird Cat C7. The seller does not know which Allison transmission it has. He does say it has overdrive. Does that mean it is a good transmission? Do you know what series it might be? TIA.

[CHEESE_WAGON]

Some info on quick ID... My guess would be it's an MD3060, but verify.

[WalterNY]

Thanks! Appreciate your help.