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  #1  
Old 05-12-2009, 08:21 PM
herffstyle herffstyle is offline
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jdm svx trans, will it work?

I have a '92 SVX, the tranny died and i found a JDM svx trans and got it. what will i need to change to make it work. its all bolted in and ready to go but i haven't started the engine yet. i just read that the jdm wont work because of the tcm. what is different? can it be modified?

thanks
Steve
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  #2  
Old 05-12-2009, 08:46 PM
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redlightningsvx redlightningsvx is offline
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Re: jdm svx trans, will it work?

I think the gear ratios are differant also but don't quote me on that.
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  #3  
Old 05-12-2009, 09:30 PM
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Re: jdm svx trans, will it work?

depends, does the back end of the transmission look any different than the old one?

Tom
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  #4  
Old 05-12-2009, 10:50 PM
oregondave oregondave is offline
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Re: jdm svx trans, will it work?

it needs the jdm tcu as well as it being designed for AWS
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  #5  
Old 05-13-2009, 02:07 AM
oab_au oab_au is offline
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Re: jdm svx trans, will it work?

Yes you will need a 3.7:1 rear diff, and swap the C solenoid for the US one. Then use the US TCU.

Harvey.
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  #6  
Old 05-13-2009, 04:54 PM
herffstyle herffstyle is offline
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Re: jdm svx trans, will it work?

Here are some pics of the trannys, the one on the jack is the JDM, the plywood is the US one.

IMG_1300.JPG

IMG_1302.JPG

IMG_1299.JPG
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  #7  
Old 05-15-2009, 12:15 AM
oregondave oregondave is offline
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Re: jdm svx trans, will it work?

Quote:
Originally Posted by oab_au View Post
Yes you will need a 3.7:1 rear diff, and swap the C solenoid for the US one. Then use the US TCU.

Harvey.
Should have kept my mouth shut
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  #8  
Old 05-15-2009, 03:46 AM
herffstyle herffstyle is offline
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Re: jdm svx trans, will it work?

where can i find the 3.7:1 gears?
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  #9  
Old 05-15-2009, 03:51 AM
1986nate 1986nate is offline
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Re: jdm svx trans, will it work?

Quote:
Originally Posted by herffstyle View Post
where can i find the 3.7:1 gears?
JDM SVX only...
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  #10  
Old 05-15-2009, 05:08 AM
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Re: jdm svx trans, will it work?

Quote:
Originally Posted by 1986nate View Post
JDM SVX only...
Not Correct.....the XT6 automatics came with 3.70's, and use the same rear diff housing as the SVX, so you'd just need to swap in the SVX LSD unit into one.....and they can be bought cheap on USMB
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  #11  
Old 05-15-2009, 05:17 PM
1986nate 1986nate is offline
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Re: jdm svx trans, will it work?

Quote:
Originally Posted by huck369 View Post
Not Correct.....the XT6 automatics came with 3.70's, and use the same rear diff housing as the SVX, so you'd just need to swap in the SVX LSD unit into one.....and they can be bought cheap on USMB
My bad, did not realize that, Huck...
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  #12  
Old 05-15-2009, 06:33 PM
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Re: jdm svx trans, will it work?

Also the 07+ wrx uses a 3.70 rear diff in the same 5bolt sideplate r160 as us. You still need to swap the guts but thats about it

Tom
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  #13  
Old 05-15-2009, 09:12 PM
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Re: jdm svx trans, will it work?

Quote:
Originally Posted by oab_au View Post
Yes you will need a 3.7:1 rear diff, and swap the C solenoid for the US one. Then use the US TCU.

Harvey.
Steve, please note.

You must retain the JDM normally open solenoid as well as the JDM TCU. The US TCU might operate after a fashion, but the programming is unlikely to suite the centre diff. set up.

Fitting a US normally closed solenoid will reverse operation in respect of front rear bias. The use of different solenoids, enables the same on/off sequence for the pulse width modulation signal, to be used for both types of transmission. There is no doubt that this is sensible economical design, resulting to several areas of reduced cost, as well as a logical common set up.
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  #14  
Old 07-16-2009, 07:09 PM
herffstyle herffstyle is offline
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Re: jdm svx trans, will it work?

I have an update,
everything is installed, tranny, rear gears with SVX LSD.
I drove the car down the road and all was well at low speed, when i needed to turn it felt strange, kinda like a 4x4 truck in 4wd on pavement. So i belive the center diff is locked or something.
I dont really know how the center diff is set up in the JDM.
I am using a US Spec TCU.

other than that it accelerates quickly and shifts nicely.

Anyone have input?
Think the JDM TCU will fix it?

Thanks
Steve
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  #15  
Old 07-16-2009, 07:13 PM
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Re: jdm svx trans, will it work?

yes

The JDM trans' center diff works on an opposite method so when the TCU commands FWD the trans will apply AWD. You will need the JDM TCU. Whether it will plug right in is the only thing I am not sure of

Tom
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