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Old 09-17-2019, 12:39 AM   #1
maloz129
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Member#: 242227
Join Date: Mar 2010
Chapter/Region: Tri-State
Location: nj 08731
Vehicle:
04 impreza wrx
san ramo red

Default 04 4EAT to 6MT

So I'm finally starting a project that I've been sitting on for many years, swapping my auto wrx to a sti 6 speed. Let me start off by saying I have no interest in selling the car to get a manual to save any hassle. The car has great sentimental value to me and I'll be keeping it.
I know that people have done this swap but I'm having trouble finding a detailed parts list on going 6mt vs 5mt.
Any input will help! I'll be starting to source out parts soon so I want to know exactly what to look for.
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Old 09-17-2019, 11:22 AM   #2
Fozymandias
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Member#: 504375
Join Date: Jul 2019
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Clutch,
Flywheel,
Slave cylinder,
Pedals,
Shifter linkages,
Shifter surround,
Re-use the auto propshaft for the 6mt,
Matching rear diff,
Starter motor,
New bolts for flywheel and bellhousing (not essential but wise)
Possibly a new pitch stop mount (May be different lengths depending on your box)
Axles should be the same.
Wiring diagrams,
More wiring diagrams,
Some different wiring diagrams,
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Old 09-17-2019, 11:35 AM   #3
maloz129
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Member#: 242227
Join Date: Mar 2010
Chapter/Region: Tri-State
Location: nj 08731
Vehicle:
04 impreza wrx
san ramo red

Default

Quote:
Originally Posted by Fozymandias View Post
Clutch,
Flywheel,
Slave cylinder,
Pedals,
Shifter linkages,
Shifter surround,
Re-use the auto propshaft for the 6mt,
Matching rear diff,
Starter motor,
New bolts for flywheel and bellhousing (not essential but wise)
Possibly a new pitch stop mount (May be different lengths depending on your box)
Axles should be the same.
Wiring diagrams,
More wiring diagrams,
Some different wiring diagrams,
Thanks for the parts list! Question about the rear dif though. I see alot of people use either the r160 or r180. Which would be better do you think? I'd like to keep the stock 5◊100 lug pattern. I was planning on a different brake kit than brembos anyway
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Old 09-17-2019, 12:30 PM   #4
Fozymandias
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Join Date: Jul 2019
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As far as I know the r180 has thicker axles so needs different hubs meaning 5x114.3

The r160 is the same so no need to change axles or hubs.

Subaru being Subaru it is entirely possible that there was a compatible 180 made at some point and, of course, an incompatible r160 - Iím sure that someone will be along with more diff knowledge than I.

Iím running an r160 with no issue (mine was a 5MT swap) and mechanically it was simple enough. The wiring was a bit more challenging but itís all good now.

What year is your car? Drop me a pm with your email address and I can send on the wiring guide I put together if itís similar model to your own.
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Old 09-17-2019, 12:33 PM   #5
Fozymandias
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Sorry - meant to add - make sure the diff ratio is compatible with your gearbox - 3.90, 4.11, 4.44 etc
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Old 09-17-2019, 12:35 PM   #6
maloz129
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Member#: 242227
Join Date: Mar 2010
Chapter/Region: Tri-State
Location: nj 08731
Vehicle:
04 impreza wrx
san ramo red

Default

Quote:
Originally Posted by Fozymandias View Post
As far as I know the r180 has thicker axles so needs different hubs meaning 5x114.3

The r160 is the same so no need to change axles or hubs.

Subaru being Subaru it is entirely possible that there was a compatible 180 made at some point and, of course, an incompatible r160 - Iím sure that someone will be along with more diff knowledge than I.

Iím running an r160 with no issue (mine was a 5MT swap) and mechanically it was simple enough. The wiring was a bit more challenging but itís all good now.

What year is your car? Drop me a pm with your email address and I can send on the wiring guide I put together if itís similar model to your own.
Ok I'll shoot you a pm. Car is an 04
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Old 09-18-2019, 12:31 AM   #7
maloz129
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Member#: 242227
Join Date: Mar 2010
Chapter/Region: Tri-State
Location: nj 08731
Vehicle:
04 impreza wrx
san ramo red

Default

Bumpppp
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Old 09-23-2019, 10:20 PM   #8
Kbellew
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Member#: 481827
Join Date: Feb 2018
Location: Murfreesboro, Tn
Vehicle:
2002 WRX WAGON(6MT)
Silver

Default

To add on to Fozymandias

You dont need a different pitch stop

You do need a different gauge cluster though.

Good luck it is possible. I did a 4eat to 6mt and have no issues. Everything works.
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Old 09-24-2019, 10:28 AM   #9
maloz129
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Member#: 242227
Join Date: Mar 2010
Chapter/Region: Tri-State
Location: nj 08731
Vehicle:
04 impreza wrx
san ramo red

Default

Quote:
Originally Posted by Kbellew View Post
To add on to Fozymandias

You dont need a different pitch stop

You do need a different gauge cluster though.

Good luck it is possible. I did a 4eat to 6mt and have no issues. Everything works.
Nice, what year? And what did you use for the shifter boot/trim? What cluster did you use?
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