23 Transmission Designations

Breakdown of BMW designation:

MANUFACTURER DESIGNATION

A5S 300J (old designation)
A	Transmission type	S = Manual transmission 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

MANUFACTURER DESIGNATION

GS6-37BZ (new designation according to BMW Group Standard GS 90007)
G	Transmission
S	Transmission type	S = Manual transmission A = Automatic transmission
6	Number of forward gears
-		- = Standard with manual gearshift HP = Hydraulic planetary gear 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= SMG 7-speed
B	Gear set	B = Gasoline gear ratio D = Diesel gear ratio S= Sport gear ratio
Z	Code letter of transmission manufacturer	G = Getrag Z = ZF (Zahnradfabrik Friedrichshafen)

Manual transmission:

MANUFACTURER DESIGNATION

BMW designation	Manufacturer	Manufacturer designation	Remark
S5D 200G	Getrag	B transmission (220/5)
S5D 200G	Getrag	B transmission (221/5)	for M41 engine only
S5D 250G	Getrag	B transmission (220/5)	Reinforced design
S5D 260Z	ZF	C-transmission (S5-31 D)	for M51 engine only
S5D 280Z	ZF	C-transmission (S5-31)
S5D 310Z	ZF	C-transmission (S5-31)	up to 9.95
S5D 320Z	ZF	C-transmission (S5-31)	from 9.95 (reinforced design)
GS5S31BZ (SMG)	ZF	C transmission	SMG
GS5-39DZ	ZF	F transmission
S6S 420G	Getrag	D-transmission (226/6)
S6S 420G (SMG)	Getrag	D transmission	SMG
S6S 560G	Getrag	E-transmission (286/6)
GS6-37BZ	ZF	H-transmission
GS6S37BZ (SMG)	ZF	H-transmission
GS6-37DZ	ZF	H-transmission
GS6-37BG	Getrag	H-transmission
GS6-53BZ	ZF	G-transmission
GS6-53DZ	ZF	G-transmission
GS6-17BG	Getrag	I-transmission
GS7S47BG (SMG)	Getrag	Transmission (247)	SMG 7-speed
GS7D36SG	Getrag	DKG436	DKG 7-speed

Automatic transmission:

MANUFACTURER DESIGNATION

BMW designation	Manufacturer	Manufacturer designation	Remark
A4S 200R	GMPT	GM4
A4S 270R	GMPT	THM-R1w	Transmission widestepped
A4S 310R	GMPT	THM-R1
A5S 300J	Jatco	Jatco
A5S 310Z	ZF	5HP-18
A5S 325Z	ZF	5HP-19
A5S 440Z	ZF	5HP-24
A5S 560Z	ZF	5HP-30
A5S 360R/390R	GM	GM5
GA6HP19Z	ZF	6HP19
GA6HP26Z	ZF	6HP26
GA6HP32Z	ZF	6HP32
GA6L45R	GM	GM6