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  #1  
Old 09-27-2007, 08:37 AM
lazer lazer is offline
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need european transmission

Hey
I've just bought a 1992 svx with a bad tranny.
Does anyone here have a working transmission for sale??

I'm situated in Norway so I would need it to be shipped

Thanks
Martin
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  #2  
Old 10-03-2007, 04:48 AM
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Hello Martin, you are very welcome to the Network.

I'm sorry for the lack of reply. This most likely reflects that not many people have good transmissions sitting around. In fact it is very common that a bad transmission is the primary reason for "retiring" or breaking SVXs.

If you could get a transmission, the likely cost in the UK would be £500 or less plus shipping, but you run the risk that it might have a fault that you would only know about when you start to use it.

Is there any chance that you could have the damaged transmission rebuilt? If there is a transmission specialist anywhere near you, they should be able to do it. The same 4EAT box is in Legacys and in Foresters, plus it is also used in some Mazdas and Nissans. So they would have no trouble getting the parts for it. It just boils down to whether they would rebuild it for you at a reasonable cost [which depends a bit on how badly burnt out your box is.]

I'll ask around.

Joe
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  #3  
Old 10-03-2007, 07:24 AM
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Joe,
For a little more background read here.

Lazer already swapped in a trans out of a Legacy and it didn't work

He has a beautiful car, hopefully it can get on the road soon.
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  #4  
Old 10-03-2007, 09:10 AM
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Hi Dave


Thanks for the heads-up

Lazer seems to have got the Legacy box moving over the weekend*. Using most Legacy boxes will be a problem for a Euro SVX. The vast majority of them are the US "rear assist" type, they have a different case than the SVX. They also have a different speed sensor, so they can't "talk" to the ECU/TCU brains of the outfit.

The only Legacy box that is a straight bolt-in solution is the trans from the JDM Legacy twin turbo, it's got the same internals and clutches, although with 4.11 final drive.

Even that one uses the US/JDM style speed sensor on the front diff, rather than internally as in the Euro one, and this implies the TCU will be different, so another electronic hurdle to jump.

Actually it's a pity he did not ask here first. I found him a UK transmission today, but he has not replied to my PM.

Joe

*PS, because of the TCU compatability problem, it would not surprise me if the Legacy box he has installed will only work in "dumb" mode. I mean changing up at preset levels, rather than using the signal inputs to decide gears etc.
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  #5  
Old 10-15-2007, 01:50 PM
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Yeah, thanks it's working now exept for the middle difflock. The light is on in the dash where it says difflock. I don't know what could be wrong with this.. Any suggestions?

Also insted of using a legacy tcu I installed a brand new wiring harness on the transmission with the svx speed sensor so that it have 2 internal speed sensors. rather than the legacy sensor located in the front diff

Last edited by lazer; 10-15-2007 at 01:58 PM.
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  #6  
Old 10-15-2007, 04:13 PM
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Quote:
Originally Posted by lazer View Post
Yeah, thanks it's working now exept for the middle difflock. The light is on in the dash where it says difflock. I don't know what could be wrong with this.. Any suggestions?

Also insted of using a legacy tcu I installed a brand new wiring harness on the transmission with the svx speed sensor so that it have 2 internal speed sensors. rather than the legacy sensor located in the front diff
Good work! You have wired the SVX loom [USA say cord ] to the Legacy tranny and used the two SVX speed sensors. I hope that works OK.

Regards the difflock, this may seem obvious, but have you checked the fuse on the main fuse board under the hood?

If your wiring was standard [I know you have rewired for the transmission loom, but bear with me a minute], then inserting a fuse [10A or 15A] into position 32 on the fuse board engages the diff lock, and the dash light is lit to remind you to remove it before driving.
[If the diff is genuinely locked it will strain the transmission when turning on tarmac]

Take the lid off the fuse box. Looking into it from over the lhs wing, on the extreme left and nearest you there are two fuse positions. The position closest to the front of the car is for the AC. The one very close to it and on its right hand side, this is normally empty. If a fuse is put into this slot, the differential is locked on Japanese or Euro gearboxes.

Check that you do not have a fuse in this position.

What I have said above relates to Euro style gearboxes.

[In the US type, with the rear-assist type gearbox they use that your Legacy box may be like, putting in this fuse has a different function or effect. It actually disconnects the electric rear drive clutch, and effectively turns the car to front-wheel drive.]

I hope this is a help.

Joe
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  #7  
Old 10-16-2007, 06:55 AM
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Well at first I was driving with the fuse out. and then when I put the fuse in there the car was still only driving in front wheel drive.
So the only difference between having the fuse in and out is the diflock light in the dash. Still only fwd. About my rewire. I did change the internal loom in the transmission as the speedsensor 2 feeds 2 more wires to the transmission connector.

In theory could I run current to the difflock solenoid in the rear to lock the diff up?? What kind of signal does this solenoid get??
If I could run 12v to the solenoid to engage this then I can check that the difflock actualy works. in the tranny
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  #8  
Old 10-16-2007, 08:42 AM
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Quote:
Originally Posted by lazer View Post
Well at first I was driving with the fuse out. and then when I put the fuse in there the car was still only driving in front wheel drive.
So the only difference between having the fuse in and out is the diflock light in the dash. Still only fwd. About my rewire. I did change the internal loom in the transmission as the speedsensor 2 feeds 2 more wires to the transmission connector.

In theory could I run current to the difflock solenoid in the rear to lock the diff up?? What kind of signal does this solenoid get??
If I could run 12v to the solenoid to engage this then I can check that the difflock actualy works. in the tranny
Martin,

I think I know what you are asking, and I'm wondering if you read my reply above to Dave?

Unless you bought a gearbox from a Twin Turbo Legacy, there is a 10:1 likelihood that you have purchased the US type 4EAT, which is the electrical rear assist type.

The software in the transmission controller in the SVX varies the torque to the axles depending on conditions. Normal or default is 35% Front, 65% Rear, and in loss of traction conditions at the back varying frontwards to 50/50. All controlled through the gearbox by the gearbox computer[TCU].

In the transmission controller for the US type [which I think you have] normal torque split is 90% Front and 10% rear. This is varied by the computer manipulating the solenoid and making torque split up to 50/50, this time if the Front wheels slip or lose traction.

You can see these are fundamentally different programmes. For that reason I think it is possible the SVX TCU [controller] that you have may not be able to vary torque split for the US type rear assist gearbox you have just installed. I could be wrong about this, but that is what I suspect.

You say you drove it with the fuse out. In this position, assuming the rear drive is activated at all, you should be getting 90 Front/10 Rear split in the default position. All of this assumes you now have what Subaru calls the Active Torque Split AWD gearbox from a Legacy, the USA type and the rear control solenoid is powered up.

Your problem here is torque distribution, rather than diff lock. If you put the fuse IN now with your current Legacy gearbox, this in theory will turn it 100% Front drive, no power to the back. Or it will if the signal goes the same path the Legacy box requires [unlikely?]

However, if you put the fuse in with the SVX box wired in, this locks the diffs at 50/50. Your rear drive using the Legacy box may be getting no power at all right now because the software in the TCU is not set up to control it. If the fuse locks anything at all in your current set-up, it would possibly be locking it to 90/10, but my guess is the signal from this fuse is only lighting up the dash light, but doing nothing at the gearbox.

If you want to persist with this Legacy transmission, I suggest the easiest way to make it work properly is to get a US style TCU to control the box.

Otherwise go for the manual or buy the correct SVX style Euro gearbox that your TCU controller is programmed to operate.

Joe
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  #9  
Old 10-18-2007, 12:31 PM
lazer lazer is offline
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Ok I think I understand now.. Wouldn't it work to run this gearbox with the legacy tcu??

I'm thinking that I can build a pwm regulator to send pulses to the solenoid in the transmission thereby regulationg the power distribution to the rear. If I only knew what kind of signal the solenoid get's......
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  #10  
Old 10-18-2007, 07:41 PM
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Quote:
Originally Posted by lazer View Post
Ok I think I understand now.. Wouldn't it work to run this gearbox with the legacy tcu??

I'm thinking that I can build a pwm regulator to send pulses to the solenoid in the transmission thereby regulationg the power distribution to the rear. If I only knew what kind of signal the solenoid get's......

Yes and no.
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