The automatic transmission number is on a label affixed to the side of the casing. The label is located between the shift lever and bracket.
A letter code is found on the transmission case either on the center bottom of the transmission, the lower clutch bell housing or on a sticker on the side of the transmission extension. Using this letter code in conjunction with the BMW parts information for the vehicle, the transmission model can be determined.
The transmission coding method has been changed and the following are examples of old versus new numbers:
The code is broken down as follows, using A5S 310Z as an example:
The code letter combination may be added to the transmission for clarification purposes, such as model year or production run changes. The following are typical code letter combinations that may be found on the transmission:
A variety of transmissions are used, usage being determined by the chassis and engine combination. By chassis and engine, this is a general application overview: