I never knew the name of the 2-speed transmission, but the 1976 Flxible 53012-6-1 were last NYCTA buses to use the 2-speed transmission. None of NYCTA's fishbowls used the V-730 until some of the Blitz rebuilds got them.
I always thought that intercity buses used 4-speed transmissions. I'm not sure, but the MC-9's transmission seems to be the same or similiar one used in MCI buses from the MC-8 right up to todays' 102D/DL3's. Of course we're talking about automatic trannys here.
There are a few FDNY pumpers that sound as if they may have 6V-92TA engines.
Wayne