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Drivetrain Gearbox, Diffs & Driveshafts etc

Impreza gearbox

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Old 09 October 2017, 09:29 AM   #1
esa.wicklund
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Default Impreza gearbox

Hello! I have a Subaru Impreza (2005, WRX, increased to 280 HP) with manual 5-gear gearbox coded ty754vn6aa. My gearbox is a bit broken and I'm in need for a replacement gearbox since it would be too expensive to fix the old one. It seems to be difficult to find a gearbox with the same model number. Do you have any advice where to get a replacement gearbox this model or other model suitable for my vehicle?
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Old 09 October 2017, 12:23 PM   #2
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Mate been there done that lol on a classic. Try AS performance on here
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Old 09 October 2017, 07:24 PM   #3
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Quote:
Originally Posted by esa.wicklund View Post
Hello! I have a Subaru Impreza (2005, WRX, increased to 280 HP) with manual 5-gear gearbox coded ty754vn6aa. My gearbox is a bit broken and I'm in need for a replacement gearbox since it would be too expensive to fix the old one. It seems to be difficult to find a gearbox with the same model number. Do you have any advice where to get a replacement gearbox this model or other model suitable for my vehicle?
As long as you fit a rear diff with the matching ratio, any classic or newage 5mt will work
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Old 09 October 2017, 10:56 PM   #4
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Originally Posted by gazney101 View Post
As long as you fit a rear diff with the matching ratio, any classic or newage 5mt will work
It can add to the cost
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Old 12 October 2017, 10:33 PM   #5
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Any of the TY754VN boxes will fit, the later 6AA boxes I believe seem slightly better but basically the VN designates a UK box with 1:1.1 drop gears using a 3.54 rear diff.
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Old 14 October 2017, 02:22 PM   #6
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Thanks for the replies.. I need to educate myself about the gearbox codes. I was told that the ratio of my gearbox is 3.9, is this false information? I find it better to find a new one with similar ratio since I'm not into changing any other parts (economics issue).. So if someone has the knowledge about the exact gearbox codes with similar ratio, I would be happy. It would really ease me to get what I need for my poor silver blobeye
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Old 15 October 2017, 11:58 PM   #7
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All the information you need is above, whoever told you your gearbox uses a 3.9 rear diff doesn't know what they are talking about. Your gearbox has a 3.9 final drive, this is then passed through the drop gears which have a 1:1.1 ratio this changes the output to the diff to 3.54.
You could always fit a 3.9 rear diff and see what happens.
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Old 16 October 2017, 08:06 AM   #8
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Actually I meant final drive - I believe my source of information know what he's talking about, but I just learned the difference as I 'educated myself' last night by googleing some information about Subaru gearboxes. I found a long list about models, it opened my eyes a bit. It seems that there are many models that would fit straightly into my car, but some of them are better than the others.

I assume my old gearbox, again coded TY754VN6AA is one of the best ones - which means many other Subaru owners have wanted that model as well - which means they're 'sold out' everywhere. Especially here where I live. I asked this from the importer of Subaru, they told that they wouldn't fix gearboxes but they can order me a new one, which would cost 7700€ + labour. Well, you know, I didn't take one. Ok, I found a service that would fix mine and they estimated it would cost 2200€. I'm sure it would be even more cos you can't tell for 100% sure, which parts of the gearbox are broken before you open it.

So, I believe I still need to keep searching one of TY754VN6AA's or TY754VN4AA's with a reasonable prize..

I e-mailed to AS Performance, thanks for that tip! Keep posting if you could help me anyhow! Thanks!!!
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Old 16 October 2017, 09:58 AM   #9
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I have a spare freshly rebuilt ..VN4AA gearbox in my garage, but would need to work out how to get it to Finland for you, if you were interested....

Steve
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Old 16 October 2017, 11:58 AM   #10
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Just be careful to not get a box that spoils the drive, for instance, if you had an import with the VB boxes and fitted a VN box/diff the gears are longer etc and vice versa for a uk car if you fit the import box the gears are shorter

my car takes the vb3fa box, those are virtually extinct now !
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Old 16 October 2017, 05:06 PM   #11
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The Rig, that's why I'm trying to find this information here to make sure the one I'm gonna put in is fitting good for my car. The box I now have is the original of that car. And the car has been used only in Finland, but my knowledge isn't good enough to tell if the car model is similar to UK ones. I think so, cos it's not similar to Japanese.. But then again, I drive at the left side. Wicked!

S10WRC, I sent you a message.
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