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Old 02-02-2013, 11:32 AM   #1
kamikami
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Default Phase 1 gearbox to suit phase 2 engine?

HI all,

About to rebuild my motor and looking at the option of upgrading from my EJ20K to an EJ207 - Now i've just realised my gearbox bell housing is phase 1, it is the 4 bolt style, not the 6 bolt style like the EJ207.

Will it bolt up? Or can it be modified to suit? If so how!?

I have an MY97/98 JDM GC8 WRX, blown bearing from the JDM aggresive ECM.

Regards,

David
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Last edited by kamikami; 02-02-2013 at 01:03 PM.
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Old 02-02-2013, 01:17 PM   #2
mod maniac
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Just use the four bolts and it will work fine. Some jdm motors don't have one of the starter holes so you have to put a heli-coil in the trany hole and use a shorter bolt. I'm not sure if that was one of them.
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Old 02-02-2013, 02:21 PM   #3
lukeskywrx
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I would be worried how long that older tranny would last on the 207.

It might be OK on the lighter GC8 but I would be hesitant to really push a bunch of power
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Old 02-02-2013, 02:38 PM   #4
drewmob
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Quote:
Originally Posted by mod maniac View Post
Just use the four bolts and it will work fine. Some jdm motors don't have one of the starter holes so you have to put a heli-coil in the trany hole and use a shorter bolt. I'm not sure if that was one of them.
This.
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Old 02-02-2013, 04:04 PM   #5
hail2theTheif
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Quote:
Originally Posted by lukeskywrx View Post
I would be worried how long that older tranny would last on the 207.

It might be OK on the lighter GC8 but I would be hesitant to really push a bunch of power
Just an assumption, but being he's running a JDM WRX setup I'm guessing he's running the matching tranny as well. Can't imagine a STi/WRX JDM tranny would have a problem handling the power considering the v3/v4 motors were putting out 280ish.

My old built Version 2 Sti w/EJ257 block put down a good 285hp/330tq to the wheels and the Version 2 tranny is still running strong 5+ years now.

Should be fine if you treat them nicely and take care of proper maintenance.
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Old 02-02-2013, 06:23 PM   #6
amroof
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You should be fine on bolting them together make sure you have the dowells in the right places as well. It will add a little more strength.
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Old 02-02-2013, 11:33 PM   #7
kamikami
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So what do i do about the extra 2 holes on the block side?
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Old 02-02-2013, 11:36 PM   #8
kamikami
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Quote:
Originally Posted by hail2theTheif View Post
Just an assumption, but being he's running a JDM WRX setup I'm guessing he's running the matching tranny as well. Can't imagine a STi/WRX JDM tranny would have a problem handling the power considering the v3/v4 motors were putting out 280ish.

My old built Version 2 Sti w/EJ257 block put down a good 285hp/330tq to the wheels and the Version 2 tranny is still running strong 5+ years now.

Should be fine if you treat them nicely and take care of proper maintenance.
Yes exactly, my EJ20K was a 280ps motor from factory.
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Old 02-03-2013, 12:35 AM   #9
drewmob
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So what do i do about the extra 2 holes on the block side?
Seriously??? Nothing.
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Old 02-03-2013, 12:52 AM   #10
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Seriously??? Nothing.
Exactly
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