Transmission Designations

BREAKDOWN OF BMW 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
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
	-
37	Transmission type
B	Gear set
Z	Code letter of transmission manufacturer	- G = Getrag - Z = ZF (Zahnradfabrik Friedrichshafen)

MANUAL TRANSMISSION:

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
GS6-37BZ (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	J-transmission (247)	SMG 7-speed

AUTOMATIC TRANSMISSION: