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Old 12-22-2005, 03:03 AM   #1
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Subaru Engine and Transmission Code Deciphering

Originally compiled by Stimpy of NASIOC.com

A lot of people throw around GC8, BC/BF, GGA, GDB, etc, but often times people don't really know what they mean. These are chassis/engine combinations for various model codes of Subarus. Some of these terms are being used interchangably, when they must be uniquely identified.

When referring to a chassis alone, you use the first two characters of the model code.

1993-2001 Impreza Chassis:
Sedan: GC
Coupe: GM
Wagon: GF

2002+ Impreza Chassis:
Sedan: GD
Wagon: GG

1990-1994 Legacy Chassis:
Sedan: BC
Wagon: BF
(Yes, the C and F indicate the same chassis as Imprezas)

1995-1999 Legacy Chassis:
Sedan: BD
Outback Wagon: BG
Wagon: BK

2000+ Legacy Chassis:
Sedan: BE
Wagon: BH

Forester Chassis:
1998-2002: SF
2003+: SG

SVX Chassis:
1992-1997: CX


The third character refers to the engine that particular chassis was equipped with from the factory. The engine code itself implies engine size, configuration, and other things like radiator type and crossmember used.

Due to some confusion on the VIN versus the applied model code, the table has been revised to show Model Codes and VINs.

Applied Model Codes:
1.8L (NA-Impreza): 5 (ie: GC5 is a 1.8L Impreza Sedan)
2.0L (pre-MY01 WRX): 8 (ie: GC8 is a 2.0L Impreza WRX Sedan)
2.0L (MY01+ WRX): A (ie: GGA is a 2.0L Impreza WRX Wagon)
2.0L (MY02+ WRX STi): B (ie: GDB is a 2.0L Impreza WRX STi Sedan)
2.2L (NA): C (ie: GFC is a 2.2L Impreza Wagon)
2.5L (NA-Impreza): E (ie: GME is a 2.5L Impreza Coupe)
2.5L (NA-Legacy): 6 (ie: BE6 is a 2.5L Legacy Sedan)
2.5L (XT): 9 (ie: SG9 is a 2.5L Forester XT)
2.5L (STi): F (ie: GDF is a 2.5L Impreza WRX STi Sedan)
3.0L (H6): 9 (ie: BE9 is a 3.0L Legacy Sedan)


VIN Chassis Codes:
1.8L: 2 (ie: GC2 is a 1.8L Impreza Sedan)
2.0L: 2 (ie: GD2 is a 2.0L Impreza WRX Sedan)
2.2L: 4 (ie: GF4 is a 2.2L Impreza Wagon)
2.5L (NA and XT): 6 (ie: GM6 is a 2.5L Impreza Coupe)
2.5L (STi): 7 (ie: GD7 is a 2.5L Impreza WRX STi Sedan)
3.0L (H6): 8 (ie: BH8 Is a 3.0L Legacy Wagon)
3.3L (H6): 3 (ie: CX3 is a 3.3L SVX)


Some of this information is trivial, but in some cases being specific will ensure the correct answer to your question.

Specific model code indication required:
If you are requesting fitment of a radiator into a GFA, there are two things to consider: GF indicates pre-MY02 Impreza chassis, while A indicates it is a 2.0L turbo engine. For a vendor to simply reply saying that, yes, they have a GC8 radiator ( when it is really a GC4/6 radiator) does NOT mean it will apply to your application. It does means it will fit the GC/GF chassis, however. Since you have a turbo engine (A), it means you probably do not want a radiator designed for a naturally aspirated engine (6).

Specific model code indication not required:
If you ask if a STi V6 drivetrain will fit into a GC8 chassis, then of course it will. That is the exact car the engine is in. However, if you are asking if it will fit into a GC/GF chassis (or maybe just GF4 specifically), then your question is less ambiguous as to what you are trying to do. However, it is obvious to see what is being asked.
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Old 12-22-2005, 03:05 AM
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Old 08-21-2006, 01:54 PM   #2
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Subaru Engine and Transmission Code Deciphering

Thanks to Dave at Rallispec ( www.rallispec.com ) for this helpful info.

Quote:
Originally Posted by RalliSpec
Please keep in mind that JDM applied model code information does not exactly match US applied model codes which doesn't match European/Australian applied model codes, etc.

In Japan "GC" is used for both 4 and 2 door models while in US they chose to designate the 2 door with a different code "GM".

Also, the 4th digit designates the series or year. For example:

GC8G4FD ... the "G" in the 4th position indicates it is a 2000 MY (Version 6). Production dates for JDM GC/GF series are:

"A" = 11/92 - 09/93 or Model year 1993
"B" = 10/93 - 08/94 or Model Year 1994
"C" = 09/94 - 08/96 or Model Years 1995 and 1996... MY 1996 was assigned Version 2 by STi
"D" = 09/96 - 08/97 or Model Year 1997 ... STi assigned this year Version 3
"E" = 09/97 - 08/98 or Model Year 1998 ... STi Version 4
"F" = 09/98 - 08/99 or Model Year 1999 ... STi Version 5
"G" = 09/99 - 07/00 or Model Year 2000 ... STi Version 6

When the GD/GG series Impreza was released in 2001 the series started over at "A" again. STi no longer applied a designation of "Version XX"...this is something that everybody else chose to continue in the interest of easy reference. In the US the series designations rarely correspond exactly to JDM designations because we often get a model a year behind Japan.

Continuing on....the 5th digit of the applied model code, as someone mentioned, indicates the number of doors. The 6th and 7th digits indicates specific equipment packages.

Regarding engine codes....these can be found on the timing cover sticker or on a sticker located on the back of the cylinder head. There are usually other numbers and such stamped into the block and head castings but these are production numbers and are not easily used for identification purposes. The engine codes used for identification should start with "EJ" for any of the later Subaru applications (Impreza, Legacy, Forester, SVX, etc.).

Digit 1 & 2...."EJ" indicates that it is one of the current boxer series motors. The EJ series started production in the mid/late eighties.

Digit 3 & 4.... displacement in liters. Example 2.0L = "20"

Digit 5.... engine series and fuel system used.

Digit 6....emissions regulations.

Digit 7....transmission type the engine was designed for. "W" = manual trans, "X" = auto trans

Digit 8,9, and 10 ...indicates minor production changes or various specification differences.

For example....ej2070w2pr-14e 917 639 gh10

This is 2.0L EJ-series motor from STi ("7" in 5th digit indicates high output version of the 2.0L MPI turbo motor used from 1999 on). I am guessing the 6th digit is a "D" and not an "O" like you indicated which would indicate a JDM spec. The "W" would indicates is out of a manual trans car. The "2" would indicate its a Version 6. The "PR" indicates that it is a standard STi (not an RA which would be "PJ"). The rest of the numbers after the dash are probably some serial number for the actual engine.

Transmission identification codes start with a "T" and an example would be:

TY856WB1AA

"T" = transmission code

"Y" = that it is a manual awd gearbox

"85" = the transmission classification...in the case of manual gearboxes this number indicates the gear shaft spacing in millimeters. 6-speed transmissions use an 85mm shaft spacing while the current generation of 5-speed transmissions use a 75mm shaft spacing.

"6" = some reference to the transmission case. "6" is used for 6-speeds, "4" is used for 8-bolt 5-speeds, "2" for 4-bolt Impreza 5-speeds, "5" for Forester 8-bolt 5-speeds, "3" for 4-bolt Forester 5-speeds, and "7" for some Legacy turbo 8-bolt 5-speeds.

"W" = transmission specification. "W" is 6-speed, "V" is 5-speed, "Z" = AT with MPT, "Y" = AT with VTD, etc.

"B1AA" = indicates various details about the equipment such as center diff. type, front LSD, etc. and also about minor production changes.

--Dave
RalliSpec
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Old 08-21-2006, 02:14 PM
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Old 11-16-2010, 05:21 PM   #3
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I have an ej22 serial #969876,what year is it? thanks,Tim
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Old 11-16-2010, 10:49 PM   #4
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Quote:
Originally Posted by tim View Post
I have an ej22 serial #969876,what year is it? thanks,Tim
There should be a VIN number etched into the flange where the transmission bolts onto the engine.
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Old 11-17-2010, 03:00 PM   #5
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engine year

there is no VEHICLE! All i have is the engine with 969876 for serial number.
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Old 11-17-2010, 03:29 PM   #6
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what style valve cover is it big and smooth with the spark plug holes in middle or is it smaller and finned covers with plugs on top of the cover
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Old 11-17-2010, 11:38 PM   #7
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Quote:
Originally Posted by tim View Post
there is no VEHICLE! All i have is the engine with 969876 for serial number.
If you bought the engine used then there will be a VIN number on the engine.
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Old 12-22-2012, 03:46 AM   #8
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Old 12-23-2012, 08:14 PM   #9
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