Some of this information may not be correct for the AUDM market, I will try to edit some of the information to correspond with our market - if I've missed something let me know! 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.

AutoZone Repair Guide for your Engine & Vehicle Identification Transmission Identification. Subaru Forester 1998-05. And serial number located on the top. Jdm subaru ej25 motor dohc quad cam 2.5l engine ej25d motor 96-97-98-99 subaru legacy & 1998 forester. Serial number.

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

Located across the top of the block on the bell housing portion and by the starter(for subaru). They aren't much good for telling you any thing however. If a subaru engine has a yellow sticker on the bell housing portion, that shortblock has gone through the SOA re-manufacturing program with Cummins OER (original equipment re-manufacturer) and is not original to the car. SOA tracks which ones have been replaced, again for recall purposes. You are required to fill out paperwork with these #s from the old short block and new along with your vin or you forfeit your core charge.

If you are ordering at a dealer, they will go off the cars VIN. If you are ordering after market you have to know what you are ordering and ordering for.

What type of build? What is your starting base? The engine being considered is shown in the 'rebuild or replace' thread started by 1-3-2-4 some time ago.

I also have a 99 with engine knock but no smoke or compression issues and I'm thinking of getting his core and rebuilding it for my car. I'm familiar with VW diesels and aircooled flat 4's, all of them go by engine serial number for parts ordering purposes because in VW world, any engine could end up anywhere and VW changes design in the middle of manufacturing runs.