Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 420

6MT-17

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

498255400

PLATE

Used for measuring backlash.

41099AA010

ENGINE SUPPORT 
BRACKET

Used for supporting engine.

41099AA020

ENGINE SUPPORT

Used for supporting engine.

398527700

PULLER ASSY

• Used for removing the extension case oil seal.
• Used for removing the front differential side 
bearing outer race. (Used together 
with18760AA000 (CLAW).)

398643600

GAUGE

Used for adjusting total end play, extension end 
play and drive pinion shim.

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

ST-498255400

ST41099AA010

ST41099AA020

ST-398527700

ST-398643600

6MT-18

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

398177700

INSTALLER

• Used for assembling the main shaft.
• Used for installing the roller bearing of transfer 
driven gear (extension case side).

399893600

PLIER

• Used for removing and installing the neutral 
set spring.
• Used together with CLAW (18756AA000).

18756AA000

CLAW

• Used for removing and installing the neutral 
set spring.
• Used together with PLIER (399893600).

499247400

INSTALLER

Used for installing the ball bearing of the transfer 
drive gear.

398497701

SEAT

• Used for installing the ball bearing of the trans-
fer drive gear.
• Used for installing the front differential side 
bearing.

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

ST-398177700

ST-399893600

ST18756AA000

ST-499247400

ST-398497701

6MT-19

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

398437700

INSTALLER

Used for installing the front differential side bear-
ing.

18632AA000

STAND ASSY

Used for disassembling and assembling the 
transmission.

18671AA000

OIL SEAL GUIDE

• Used for installing the reverse check shaft oil 
seal.
• Used for installing the shifter arm oil seal.
• Used together with INSTALLER 
(18657AA010).

18657AA010

INSTALLER

• Used for installing the reverse check shaft oil 
seal.
• Used together with OIL SEAL GUIDE 
(18671AA000).

18657AA000

INSTALLER

• Used for installing the shifter arm oil seal.
• Used together with OIL SEAL GUIDE 
(18671AA000).

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

ST-398437700

ST18632AA000

ST18671AA000

ST18657AA010

ST18657AA000

6MT-20

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

18758AA000

PULLER

Used for removing the transfer driven gear bear-
ing outer race.

18831AA000

GAUGE

Used for selecting the transfer driven gear bear-
ing thrust washer.

18631AA000

HANDLE

Used for measuring the front differential back-
lash.

18754AA000

REMOVER

Used to remove parts of the driven gear.

18757AA000

STRAIGHT PIN 
REMOVER

Used for installing the reverse idler gear.

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

ST18758AA000

ST18831AA000

ST18631AA000

ST18754AA000

ST18757AA000