EJ257 to TH400 adapter plate.

thorne · 06-16-2012, 03:43 AM

I'm looking for a adapter plate for a subaru to GM trans. I've tried various search terms on google and have not found any good results

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thorne · 06-16-2012, 03:48 AM

Or any other RWD Auto trans that won't cost a arm in and a leg to hold 400whp

iana · 06-16-2012, 11:17 PM

Stock subaru 4-5speed auto will hold that fine.

iana · 06-16-2012, 11:20 PM

Also try www.v-eight.com. If you can supply some dimensions ed could draw it up for you ready to give to machinist.

thorne · 06-17-2012, 02:00 AM

Quote:

Originally Posted by iana

Stock subaru 4-5speed auto will hold that fine.

No it won't

thorne · 06-17-2012, 02:21 AM

Quote:

Originally Posted by iana

Also try www.v-eight.com. If you can supply some dimensions ed could draw it up for you ready to give to machinist.

What's odd is I called wilcap who made a one off and they said someone produces one. I tried to search for the term the gentleman gave me. But I couldn't find any th400 results other than wilcaps.

Subaru EJ Adapter plate
Subaru transmission Adapter
and tons of other variants.

I wonder if there are any others out there interested in adapter a GM transmission for RWD subaru use.

My 1997 EJ257 18g wagon on wastegate was a blast RWD with a welded center diff and welded rear diff. *03 wrx diff. The diff let go few weeks ago so im going nissan

iana · 06-18-2012, 08:08 AM

What's makes you say the auto wont? Plenty of people have them and they work fine. Plenty of supercharged ez30/36's make more torque and do it on stock autos.

Doubt you'll find something off the shelf, hence speak to Ed on that site and it can be drawn.

thorne · 11-03-2012, 03:42 PM

I've been looking for the past 5 months for a solution, I'm so tired of breaking transmissions.

I'm looking into having a part fabbed, if anyone is interested in a similar adapter plate pm me...

400$ for a gearbox that can hold 800hp.

97ej22e · 11-06-2012, 08:29 AM

unless you have that th400 beefed up it will not hold anywhere near 800hp.. I've owned many chevy's before coming to Subaru and I know it's just not possible without building the trans...

Paidfor · 11-07-2012, 01:54 PM

billsautofab.com
Hes got anything you want, and yes....that TH400 will hold a sheetload more than any stock WRX or STi tranny ever will.

STIll inspired · 11-07-2012, 03:57 PM

have you considered an sti 6spd with a rwd spool? they hold 500+whp on awd i would imagine that you would be just fine with only rwd loads on it. also you won't need any adapter plate made.

i understand you want an automatic transmission though. if you are firmly set on that, make some measurments and take those to a machine shop they should be able to CNC a piece for you. you can make sheet metal templates or something to draw measurements from.

robduf · 11-07-2012, 05:59 PM

I've currently got a build that runs 407 whp and 400 tq through a 2004 STi six speed.

Paidfor · 11-08-2012, 02:42 PM

^^^^Sounds like everyone else on here with a STi.

thorne · 11-26-2012, 03:32 PM

six speed swap costs to much and I have a feeling i'd break it.

riseautosalon · 12-28-2012, 05:19 PM

A dodge 727 can be built to handle that kind of power for cheap. And those trannies are probably more plentiful

Extreme Turbo Systems · 12-28-2012, 06:33 PM

The only one I could find was the Wilcap on there website. Why cant they just sell that to you?

flstffxe · 12-28-2012, 08:32 PM

old threads but the members are still some what active. PM might get a response.
http://forums.nasioc.com/forums/show....php?t=1881527

http://forums.nasioc.com/forums/show....php?t=1628337

Other possible leads
http://www.ultimatesubaru.org/forum/...splay.php?f=28

http://www.ultimatesubaru.org/forum/...d.php?t=111709

http://www.transmissionadapters.com/

http://www.advanceadapters.com/

06-16-2012, 03:43 AM	#1
thorne Scooby Newbie Member#: 130063 Join Date: Oct 2006 Location: Ohio Vehicle: 2003 WRX Silb	EJ257 to TH400 adapter plate. I'm looking for a adapter plate for a subaru to GM trans. I've tried various search terms on google and have not found any good results * Registered users of the site do not see these ads.

11-03-2012, 03:42 PM	#8
thorne Scooby Newbie Member#: 130063 Join Date: Oct 2006 Location: Ohio Vehicle: 2003 WRX Silb	still nothing... I've been looking for the past 5 months for a solution, I'm so tired of breaking transmissions. I'm looking into having a part fabbed, if anyone is interested in a similar adapter plate pm me... 400$ for a gearbox that can hold 800hp.

11-07-2012, 03:57 PM	#11
STIll inspired Scooby Newbie Member#: 248431 Join Date: Jun 2010	have you considered an sti 6spd with a rwd spool? they hold 500+whp on awd i would imagine that you would be just fine with only rwd loads on it. also you won't need any adapter plate made. i understand you want an automatic transmission though. if you are firmly set on that, make some measurments and take those to a machine shop they should be able to CNC a piece for you. you can make sheet metal templates or something to draw measurements from. Last edited by STIll inspired; 11-07-2012 at 05:54 PM.

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06-16-2012, 03:48 AM	#2
thorne Scooby Newbie Member#: 130063 Join Date: Oct 2006 Location: Ohio Vehicle: 2003 WRX Silb	Or any other RWD Auto trans that won't cost a arm in and a leg to hold 400whp

06-16-2012, 11:17 PM	#3
iana Scooby Newbie Member#: 252934 Join Date: Jul 2010 Location: Island Gaol Vehicle: 99	Stock subaru 4-5speed auto will hold that fine.

06-16-2012, 11:20 PM	#4
iana Scooby Newbie Member#: 252934 Join Date: Jul 2010 Location: Island Gaol Vehicle: 99	Also try www.v-eight.com. If you can supply some dimensions ed could draw it up for you ready to give to machinist.

06-18-2012, 08:08 AM	#7
iana Scooby Newbie Member#: 252934 Join Date: Jul 2010 Location: Island Gaol Vehicle: 99	What's makes you say the auto wont? Plenty of people have them and they work fine. Plenty of supercharged ez30/36's make more torque and do it on stock autos. Doubt you'll find something off the shelf, hence speak to Ed on that site and it can be drawn.

11-06-2012, 08:29 AM	#9
97ej22e Scooby Newbie Member#: 327710 Join Date: Jul 2012 Chapter/Region: NESIC Location: Eastern, CT Vehicle: 1999 Impreza OBS Green	unless you have that th400 beefed up it will not hold anywhere near 800hp.. I've owned many chevy's before coming to Subaru and I know it's just not possible without building the trans...

11-07-2012, 01:54 PM	#10
Paidfor Scooby Specialist Member#: 267815 Join Date: Dec 2010 Chapter/Region: South East Location: 04STi JAVA Vehicle: EVO Woudve been Cheaper!!!!!	billsautofab.com Hes got anything you want, and yes....that TH400 will hold a sheetload more than any stock WRX or STi tranny ever will.

11-07-2012, 05:59 PM	#12
robduf Scooby Newbie Member#: 171837 Join Date: Feb 2008 Chapter/Region: NWIC Location: Milton, WA Vehicle: 1999 2.5 RS Orange-Black	I've currently got a build that runs 407 whp and 400 tq through a 2004 STi six speed.

11-08-2012, 02:42 PM	#13
Paidfor Scooby Specialist Member#: 267815 Join Date: Dec 2010 Chapter/Region: South East Location: 04STi JAVA Vehicle: EVO Woudve been Cheaper!!!!!	^^^^Sounds like everyone else on here with a STi.

11-26-2012, 03:32 PM	#14
thorne Scooby Newbie Member#: 130063 Join Date: Oct 2006 Location: Ohio Vehicle: 2003 WRX Silb	six speed swap costs to much and I have a feeling i'd break it.

12-28-2012, 05:19 PM	#15
riseautosalon Scooby Newbie Member#: 341870 Join Date: Dec 2012	A dodge 727 can be built to handle that kind of power for cheap. And those trannies are probably more plentiful

12-28-2012, 06:33 PM	#16
Extreme Turbo Systems NASIOC Vendor Member#: 194655 Join Date: Nov 2008 Chapter/Region: NWIC Location: Vancouver, WA Vehicle: 08 STI White	The only one I could find was the Wilcap on there website. Why cant they just sell that to you?

12-28-2012, 08:32 PM	#17
flstffxe Scooby Specialist Member#: 155358 Join Date: Jul 2007 Location: Coon Rapids, MN Vehicle: 2008 Forester Steel Silver	old threads but the members are still some what active. PM might get a response. http://forums.nasioc.com/forums/show....php?t=1881527 http://forums.nasioc.com/forums/show....php?t=1628337 Other possible leads http://www.ultimatesubaru.org/forum/...splay.php?f=28 http://www.ultimatesubaru.org/forum/...d.php?t=111709 http://www.transmissionadapters.com/ http://www.advanceadapters.com/