Transmission Identification

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BMW automatic transmissions are manufactured by two suppliers for the US market:

Zahnradfabrik Friedrichshafen: Commonly referred to as ZF. ZF manufactures both manual and automatic transmissions.
GM Powertrain - Hydramatic: Hydramatic is a manufacturing division of General Motors located in Strasbourg France. Hydramatic supplies automatic transmissions to BMW for four and six-cylinder vehicles.

BMW has developed an internal numbering system for their transmissions for parts ordering, information research and identification. Also, each manufacturer uses their own internal identification system. Here is a breakdown of these identification codes. See Fig 1.

Fig 1: Transmission Code Breakdown

Courtesy of BMW OF NORTH AMERICA, INC.