Breakdown of BMW designation

WARNING: This page is about a different car, the 2010 BMW 650i, 2009 BMW 650i, 2008 BMW 650i, 2007 BMW 650i, and 2006 BMW 650i. However, it is still accessible from the selected car via links, so may be relevant.

BREAKDOWN OF BMW DESIGNATION (A5S 300J)

A5S 300J (former designation)
A	Transmission type	S = Manual gearbox A = Automatic transmission
5	Number of forward gears
S	Type of top gear	D = Direct gear S = Overdrive gear
300	Max. input torque (Nm)
J	Code letter of transmission manufacturer	G = Getrag J = Jatco R = GMPT (General Motors Powertrain) Z = ZF (Zahnradfabrik Friedrichshafen)
SMG	Notes	SMG = Sequential M gearbox/transmission

BREAKDOWN OF BMW DESIGNATION (GS6-37BZ)

GS6-37BZ (new designation according to BMW Group Standard GS 90007)
G	Transmission
S	Transmission type	S = Manual gearbox A = Automatic transmission
6	Number of forward gears
-		- = Standard with manual gearshift HP = Hydraulic planetary gear train DKG= Twin-clutch transmission/gearbox
37	Transmission type	26 = D-transmission 31 = C-transmission 39 = F-transmission 37 = H-transmission 53 = G-transmission 17 = I-transmission 47= J transmission SMG -7-speed 45 = K transmission 36= Transmission DKG
B	Gear set	B = Petrol gear ratio D = Diesel gear ratio S= Sport gear ratio
Z	Code letter of transmission manufacturer	G = Getrag Z = ZF (Zahnradfabrik Friedrichshafen)