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Old 06-16-2012, 03:43 AM   #1
thorne
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Default 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
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Old 06-16-2012, 03:48 AM   #2
thorne
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Or any other RWD Auto trans that won't cost a arm in and a leg to hold 400whp
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Old 06-16-2012, 11:17 PM   #3
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Stock subaru 4-5speed auto will hold that fine.
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Old 06-16-2012, 11:20 PM   #4
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Also try www.v-eight.com. If you can supply some dimensions ed could draw it up for you ready to give to machinist.
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Old 06-17-2012, 02:00 AM   #5
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Quote:
Originally Posted by iana View Post
Stock subaru 4-5speed auto will hold that fine.
No it won't
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Old 06-17-2012, 02:21 AM   #6
thorne
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Quote:
Originally Posted by iana View Post
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
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Old 06-18-2012, 08:08 AM   #7
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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.
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Old 11-03-2012, 03:42 PM   #8
thorne
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Default 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.
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Old 11-06-2012, 08:29 AM   #9
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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...
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Old 11-07-2012, 01:54 PM   #10
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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.
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Old 11-07-2012, 03:57 PM   #11
STIll inspired
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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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Old 11-07-2012, 05:59 PM   #12
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I've currently got a build that runs 407 whp and 400 tq through a 2004 STi six speed.
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Old 11-08-2012, 02:42 PM   #13
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^^^^Sounds like everyone else on here with a STi.
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Old 11-26-2012, 03:32 PM   #14
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six speed swap costs to much and I have a feeling i'd break it.
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Old 12-28-2012, 05:19 PM   #15
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A dodge 727 can be built to handle that kind of power for cheap. And those trannies are probably more plentiful
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Old 12-28-2012, 06:33 PM   #16
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The only one I could find was the Wilcap on there website. Why cant they just sell that to you?

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Old 12-28-2012, 08:32 PM   #17
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