Swapping Diffs Between Legacy and Impreza

subydude · 12-17-2008, 11:28 PM

I've been trying to read up on the VTD center diff used in the Legacy Outback VDC and the auto WRX and had a couple questions that searches couldn't answer.

Is it possible to swap a VTD diff into a manual 5-speed? If so, would it be possible to swap the final drive "ring" to make it work with the rear end?

If I could swap that into a 5-speed, would it stay "locked" in the open position at 45/55?

My main goal behind this is to find a center diff that has a slightly more tarmac friendly setting than the stock viscous 50/50.

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DS1 · 12-18-2008, 12:45 PM

The VTD in an auto would be like the DCCD in a manual trans.

There are DCCD 5mts from the older GC8's

-Dylan @ DS1

subydude · 12-18-2008, 12:51 PM

Quote:

Originally Posted by DS1 Motorsports

The VTD in an auto would be like the DCCD in a manual trans.

There are DCCD 5mts from the older GC8's

-Dylan @ DS1

True. I was just looking for something that was more available and at a more friendly price. Something I could throw in for a few hundred dollars and have instant response vs the viscous. The 5-speed car is used for rallyx just in case you were wondering the use of the car.

I also have a Ver 7 non-dccd 6-speed in a different car that has the viscous center that I've been trying to find a better center diff for. In the end it looks like I'll have to swap to a dccd tranny simply because there are no good "preset" options from the factory that don't make it act like a RWD car.

supersuby2 · 12-19-2008, 12:59 AM

You can get the 12 kg center diff for GC and 20 kg center diff for the GD..... they work great over the stock 4 kg units and can be had 400-500 lightly used or 900 new. keeps front and rear axle speeds very close all the time

subydude · 12-19-2008, 09:00 AM

Quote:

Originally Posted by supersuby2

You can get the 12 kg center diff for GC and 20 kg center diff for the GD..... they work great over the stock 4 kg units and can be had 400-500 lightly used or 900 new. keeps front and rear axle speeds very close all the time

I've found the 20kg diff, but I haven't found the 12 yet. Where have you seen the 12?

FuJi K · 12-19-2008, 12:36 PM

the 12kg unit is only for PHASE1 trannies
STi V1-STi Ver4 5spds

the 20kg unit is only for PHASE2 trannies
STi Ver5+ 5spds

The 6spd VLSD center diff is constructed differently. Not the same part.

Jack88 · 12-20-2008, 07:48 PM

goodluck

supersuby2 · 12-20-2008, 09:17 PM

I thought he is looking for a 5 speed center diff...... rallispec would be worth a try but if you have the phase 2 trans 2001 and newer i believe you will only be able to get a 20 kg center.

subydude · 12-21-2008, 01:47 AM

Quote:

Originally Posted by supersuby2

I thought he is looking for a 5 speed center diff...... rallispec would be worth a try but if you have the phase 2 trans 2001 and newer i believe you will only be able to get a 20 kg center.

I was kind of looking for both a 5-speed and 6-speed option. I wasn't sure if they were different or the same.

The 5-speed is from a 2000 2.5rs so I'm guessing Phase 2. Whenever time and money allows I guess I'll be looking for the 20kg center for it.

supersuby2 · 12-21-2008, 08:25 PM

You will like the 20kg center, it will make the car push more on pavement but can be tuned out with suspension adjustments and will be very worth it on lose conditions......

subydude · 12-21-2008, 09:52 PM

Quote:

Originally Posted by supersuby2

You will like the 20kg center, it will make the car push more on pavement but can be tuned out with suspension adjustments and will be very worth it on lose conditions......

That's more or less what I figured. The car is mainly going to be used for RallyX, with some spirited on road driving in between. I'll just be running KYB AGX's with some stiff springs and a set of sways. I won't mind if it pushes a little bit on the road as long as it does it's job off the road

supersuby2 · 12-24-2008, 02:52 AM

It will work well off road and wont be that bad on road.... you will like it!

12-17-2008, 11:28 PM	#1
subydude Scooby Specialist Member#: 80649 Join Date: Jan 2005 Chapter/Region: South East Location: Columbia, SC Vehicle: 2000 2.5 Auto-X RSTi What's A Head Gasket?	Swapping Diffs Between Legacy and Impreza I've been trying to read up on the VTD center diff used in the Legacy Outback VDC and the auto WRX and had a couple questions that searches couldn't answer. Is it possible to swap a VTD diff into a manual 5-speed? If so, would it be possible to swap the final drive "ring" to make it work with the rear end? If I could swap that into a 5-speed, would it stay "locked" in the open position at 45/55? My main goal behind this is to find a center diff that has a slightly more tarmac friendly setting than the stock viscous 50/50. * Registered users of the site do not see these ads.

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12-18-2008, 12:45 PM	#2
DS1 Vendor Member#: 111780 Join Date: Apr 2006 Chapter/Region: MWSOC Location: Schaumburg, IL	The VTD in an auto would be like the DCCD in a manual trans. There are DCCD 5mts from the older GC8's -Dylan @ DS1

12-19-2008, 12:59 AM	#4
supersuby2 Scooby Newbie Member#: 161678 Join Date: Oct 2007 Location: Marquette MI Vehicle: 2002 wrx white	You can get the 12 kg center diff for GC and 20 kg center diff for the GD..... they work great over the stock 4 kg units and can be had 400-500 lightly used or 900 new. keeps front and rear axle speeds very close all the time

12-19-2008, 12:36 PM	#6
FuJi K Scooby Guru Member#: 3687 Join Date: Jan 2001 Chapter/Region: MWSOC Location: St. Paul, MN Vehicle: MY99 GF4 JDM 6spd NF Performance	the 12kg unit is only for PHASE1 trannies STi V1-STi Ver4 5spds the 20kg unit is only for PHASE2 trannies STi Ver5+ 5spds The 6spd VLSD center diff is constructed differently. Not the same part.

12-20-2008, 07:48 PM	#7
Jack88 Scooby Newbie Member#: 198032 Join Date: Dec 2008 Chapter/Region: SCIC	goodluck

12-20-2008, 09:17 PM	#8
supersuby2 Scooby Newbie Member#: 161678 Join Date: Oct 2007 Location: Marquette MI Vehicle: 2002 wrx white	I thought he is looking for a 5 speed center diff...... rallispec would be worth a try but if you have the phase 2 trans 2001 and newer i believe you will only be able to get a 20 kg center.

12-21-2008, 08:25 PM	#10
supersuby2 Scooby Newbie Member#: 161678 Join Date: Oct 2007 Location: Marquette MI Vehicle: 2002 wrx white	You will like the 20kg center, it will make the car push more on pavement but can be tuned out with suspension adjustments and will be very worth it on lose conditions......

12-24-2008, 02:52 AM	#12
supersuby2 Scooby Newbie Member#: 161678 Join Date: Oct 2007 Location: Marquette MI Vehicle: 2002 wrx white	It will work well off road and wont be that bad on road.... you will like it!