Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 421

6MT-21

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

18665AA000

HOLDER

• Used for removing and installing the main 
shaft lock nut.
• Used together with BASE (18664AA000).

18666AA000

HOLDER

• Used for removing and installing the driven 
shaft lock nut.
• Used together with BASE (18664AA000).

18667AA000

HOLDER

• Used for removing and installing the drive pin-
ion shaft lock nut.
• Used together with BASE (18664AA000).

18664AA000

BASE

• Used for removing and installing the main 
shaft lock nut.
• Used for removing and installing the drive pin-
ion shaft lock nut.
• Used for removing and installing the driven 
shaft lock nut.

18722AA010

REMOVER

Used for disassembling the main shaft.

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

ST18665AA000

ST18666AA000

ST18667AA000

ST18664AA000

ST18722AA010

6MT-22

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

18651AA000

INSTALLER

Used for assembling the main shaft.

18852AA000

TORQUE WRENCH • Used to tighten the main shaft lock nut.

• Used to tighten the drive pinion shaft lock nut.
• Used to tighten the driven shaft lock nut.

18668AA000

PUNCH

Used to crimp the main shaft lock nut.

18669AA000

PUNCH

Used to crimp the driven shaft lock nut.

18670AA000

PUNCH

Used to crimp the drive pinion shaft lock nut.

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

ST18651AA000

ST18852AA000

ST18668AA000

ST18669AA000

ST18670AA000

6MT-23

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

18620AA000

ADAPTER 
WRENCH

Used for removing and installing the driven gear 
shaft lock nut.

18621AA000

ADAPTER 
WRENCH

Used for removing and installing the drive pinion 
shaft lock nut.

18723AA000

REMOVER

Used for disassembling the driven shaft.

18630AA000

WRENCH ASSY

Used for removing and installing the differential 
side retainer LH.

18672AA000

GUIDE CLIP

Used for installing the reverse idler snap ring.

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

ST18620AA000

ST18621AA000

ST18723AA000

ST18630AA000

ST18672AA000

6MT-24

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

18720AA000

REMOVER

Used for disassembling the main shaft.

18654AA000

INSTALLER

Used for assembling the driven shaft.

18663AA000

SOCKET

Used for removing and installing the transfer 
bearing holder.

18853AA000

HEIGHT GAUGE

• Used for selecting the shift rod.
• Used for selecting the snap ring and washer of 
the main shaft.

18760AA000

CLAW

• Used for removing the front differential side 
bearing outer race.
• Used together with PULLER ASSY 
(398527700).

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

ST18720AA000

ST18654AA000

ST18663AA000

ST18853AA000

ST18760AA000