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Old 09-24-2011, 05:18 AM   #101
T.McRally
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Can anyone tell me which diff gets hotter a helical or a plated ?

Thanks



It's Ok, I'm sorted.

The plated diff creates more heat.



.
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Last edited by T.McRally; 09-25-2011 at 06:19 PM.
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Old 10-05-2011, 11:15 AM   #102
Bishop
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Quote:
Originally Posted by sponaugle View Post
Here are the part numbers for each of the diffs (front, rear, and center)

Rear Diff

38410AA080 - 2004 Rear Diff Unit
38410AA080 - 2005 Rear Diff Unit
38410AA120 - 2006 Rear Diff Unit
38410AA140 - 2007 Rear Diff Unit

NOTES: 04 and 05 are the same. I have taken an 04 Diff apart, and rest assured it is clutch pack based. 2006 had a new rear diff, as did 2007.


Front Diff

38410AA060 - 2004 Front Diff Unit
38410AA100 - 2005, 2006, 2007 Front Diff Unit

NOTES: Sure enough, the 04 US 6MT had a Suretrac front diff, as the 060 part number is also used in the Version 8 JDM 6 Speed ( C, D ). 05, 06, and 07 all have the same front diff.


Center Diff (DCCD)
38913AA160 - 2004, 2005 Center Diff Unit
38913AA190 - 2006, 2006 Center Diff Unit


NOTES: 04 and 05 has the same center DCCD unit, which was upgraded in 06. The center diff used in all cases (160 and 190) are the same as used in the JDM 6 speed of the same years. AA160 was used in C,D, and E JDM 6 speeds, and AA190 was used in F and G.

Does anyone know if it would be possible to use the Front LSD out of a 2011 STi in a 04 STi?

tia
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Old 02-02-2012, 01:07 PM   #103
seanwstrum
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Default 96 sti ver 3 gf8 trans swap

What would it take to put a newer 6spd in mw 96 gf8
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Old 02-02-2012, 07:29 PM   #104
Unabomber
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You posting in the right thread.
You reading the sticky threads.
You not being so damn vague.
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Old 02-04-2012, 09:02 PM   #105
aboothman
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Quote:
Originally Posted by seanwstrum View Post
What would it take to put a newer 6spd in mw 96 gf8
Pretty much the same as putting it into a GD.
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Old 03-10-2012, 11:44 AM   #106
delhiforester
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I would really appreciate some recommendations for a rear LSD upgrade.

My vehicle is an '04 Forester body with '04 Sti drivetrain (from a USDM, California donor), set up for stage rally. It is really a purpose built rally car that sees mostly dirt/gravel/sand for competition. You can see a picture here http://www.xplorearth.com/ . All differentials, front/center/rear are '04 USDM Sti stock. Running a DCCDPro controller for the center diff.

What makes it fun is that I can still drive it on the street since the road regulations in India are not very strict, so I get away with driving a rally car on the street .

I have had problems with my rear stock differential, and have seen lots of metallic particles and chunks coming out with the oil. So my conclusion is that the rear LSD is not working much and needs repair or replacement.

Looking for advice on what to do next:

1. Repair the LSD - parts are expensive and takes specialized skill to do correctly. Not sure that I can do it correctly, or have the time to do it over and over till I get it right.

2. Purchase an aftermarket LSD that will give better performance than the stock LSD, and is plug and play. Advantage is that I could buy a unit that is better suited to dirt/gravel/sand.

3. Recommendations on future upgrades for the front & center diffs based on my type of usage.

So please let me know your opinions. Thanks!
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Old 01-02-2014, 01:20 PM   #107
LouisFCO
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This might be a newbie question, though my comprehension is a bit better than that.

- On a bone-stock, daily driver 2002 wrx, what would be the advantages/disadvantages to swapping in an ATB rear differential over the stock unit?

AND

- Would one need to upgrade the center differential as well?

I am trying to understand how the various upgrades affect the handling/driving in Subaru's AWD setup. I am familiar with Quaife's ATB in FWD Volkswagens, but it seems like the changes in handling are more extreme? In my Corrado, I can just expect more understeer.
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Old 01-02-2014, 08:07 PM   #108
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Your OEM rear will last forever, an aftermarket will not and make zero difference on a daily driver.

If you upgraded the center from DCCD, you'd be buying a unit that costs more than your whole car.
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Old 01-03-2014, 09:07 PM   #109
djdawson2
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Default Brand new

I'm old (49) - bought my first Subaru 4 days ago. It's an '05 Sti with 27k miles on it. My life has been Audis and Porsches, so I'm new to these cars completely - but I've been doing heavy work and mods for decades.

So - my test ride was a complete joy. Probably 10 miles of driving around, but probably never broke 60mph. I buy the car. I never put a ton of time into pre-purchase because I'm used to doing or rebuilding everything on my own, and have a very well equipped shop.

My mistake - I drive the car the 40+ miles to my home. The first time I come to a complete stop when nearing my house, a start out in 1st while making a slight turn, and it sounds like the drivetrain is about to come entirely out of the car... I mean BAD clunking/clanking and binding. The binding reminds me of a failed viscous coupler in a Jeep, but the banging/clanking I've never heard before.

I let the car sit overnight... the next day, nothing. This makes it even more compelling that it is the center diff... only acting up once it gets hot.

I drive it around today to 3 local (Denver) Subaru tuner shops, and they all seem to agree.

So, here I am at this thread. I don't want to mod - I just want to replace the center diff with OE. I've done them on other cars, and they are typically not difficult at all.

For the new guy - where can I get the OE center diff for a decent price? Secondly, any links to a replacement procedure would be great.

Thanks,
Dave
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Old 01-03-2014, 11:54 PM   #110
Unabomber
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Dave,

Call these asshats. They are Porsche AND Subaru trans pros

Guard Transmisson LLC
6904 Ridge Valley Ct
Loveland,CO 80538

(970) 669-7144
gtgears@yahoo.com
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Old 01-04-2014, 12:43 AM   #111
djdawson2
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Asshats? Is that a recommendation?

I'll give them a call. I think I may end up doing this myself. The seller has agreed to cover the cost it seems, but I may rather learn it than have someone do it for me.

I'll give them a call - see if they might have the diff.

Thanks,
Dave
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Old 01-04-2014, 09:38 AM   #112
Unabomber
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Asshats is my term of endearment for them. If they can't help you, you have REALLY done something "great" in the driveline world.
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Old 01-23-2014, 06:54 PM   #113
Crazyced
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I have a 04' WRX and love it, but in the snow, the back end tend to swing around during acceleration (straight line). I was thinking of the possibilities of having a mechanical LSD in the rear to correct this.

But now I wonder, wouldn't the benefits be very negligible as long as I have the weak stock viscous center diff? I mean the newfound available traction in the rear would be bypassed to the front as soon as some slippage appear wouldn't it?
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Old 01-23-2014, 07:30 PM   #114
Unabomber
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LSDs are expensive. Unless you are snow racing, spending several hundred to a thousand to correct an annoyance on a daily driver is rather silly. Is it worth it?
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Old 01-23-2014, 11:03 PM   #115
Crazyced
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Quote:
Originally Posted by Unabomber View Post
LSDs are expensive. Unless you are snow racing, spending several hundred to a thousand to correct an annoyance on a daily driver is rather silly. Is it worth it?
It would be relative to the person and how cheap they could get one for.

But thinking about the possibilities is free though, hence the question.
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Old 02-14-2014, 06:10 PM   #116
derkahn
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good read for those who are fully down the differential rabbit hole..old (er) than most info out there but interesting.http://www.oldrallysport.on.ca/articles/diffs.html

Last edited by derkahn; 02-14-2014 at 09:29 PM. Reason: sp
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Old 02-17-2014, 10:35 PM   #117
TravelinMan
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Quote:
Originally Posted by djdawson2 View Post
I'm old (49) - bought my first Subaru 4 days ago. It's an '05 Sti with 27k miles on it. My life has been Audis and Porsches, so I'm new to these cars completely - but I've been doing heavy work and mods for decades.

So - my test ride was a complete joy. Probably 10 miles of driving around, but probably never broke 60mph. I buy the car. I never put a ton of time into pre-purchase because I'm used to doing or rebuilding everything on my own, and have a very well equipped shop.

My mistake - I drive the car the 40+ miles to my home. The first time I come to a complete stop when nearing my house, a start out in 1st while making a slight turn, and it sounds like the drivetrain is about to come entirely out of the car... I mean BAD clunking/clanking and binding. The binding reminds me of a failed viscous coupler in a Jeep, but the banging/clanking I've never heard before.

I let the car sit overnight... the next day, nothing. This makes it even more compelling that it is the center diff... only acting up once it gets hot.

I drive it around today to 3 local (Denver) Subaru tuner shops, and they all seem to agree.

So, here I am at this thread. I don't want to mod - I just want to replace the center diff with OE. I've done them on other cars, and they are typically not difficult at all.

For the new guy - where can I get the OE center diff for a decent price? Secondly, any links to a replacement procedure would be great.

Thanks,
Dave
This should help:
http://www.subaruforester.org/vbulle...ce-them-46979/
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Old 08-18-2014, 12:58 AM   #118
skunkman
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sub'd for reference!
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Old 09-12-2014, 10:17 AM   #119
calebw15
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Bump from the dead -- I have a JDM 6 speed and my r160 attached to it just locked up last night so I'm trying to find a r180 to replace it but I cannot find the rear diff gearing for the life of me. Is it 3.54 or 3.9? My transmission code is Ty856wb7ka
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