D3XX was certainly the lead up to the 3300 series John, as to the rest sorry I am not sure on that but am sure someone on here will be.
My understanding is that the 33xx series will have an engine serial number different from the tractor, where one of the earlier D3XX and D3XXC engines has the serial number of the machine in which it is installed (originally installed)
Changed from D333T to D3306 engine s/n 93N1175 in 1972.
Pete post them a pic of the front covers so they can compare them.
Later Bob
Hi Bob,
D333C and 3306 Front views....
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