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TY754VN2AA REAR DIFF

Old 01 November 2008, 11:07 PM
  #1  
Ash911gtr
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Default TY754VN2AA REAR DIFF

Hi all, just wondering if anyone can tell me the rear diff that is compatible with the above gearbox no.?
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Old 02 November 2008, 10:37 AM
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i think the diff ratio is 3:9 in that gearbox. ive got that gearbox code so
only 2002
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Old 02 November 2008, 12:50 PM
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VN = uk box, so therefore UK rear diff.....
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Old 02 November 2008, 04:09 PM
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Cheers guys
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Old 02 November 2008, 04:21 PM
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Originally Posted by scooby-matt View Post
i think the diff ratio is 3:9 in that gearbox. ive got that gearbox code so
only 2002
Is yours a long ratio 5 speed BTW? Just checking cos i had this box installed into a 99 type r.
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Old 02 November 2008, 10:01 PM
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Default rear dif

US Impreza WRX MY02 TY754VN2AA 3.454 1.947 1.366 0.972 0.738 3.333 1.100 3.900 Viscous (4kgf) Open
3.9 final drive with 1.1 to 1 drop gears so 3.54 rear diff
regards andy
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Old 02 November 2008, 10:19 PM
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Ash911gtr:- i wasnt aware they did a long ratio, ive currently got a ppg gearset in it now.

andyscoobym3:- how come this is a us impreza box? also what does 1.1 to 1 drop gears mean?

thanks matt
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Old 02 November 2008, 10:51 PM
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Strange, I was told this is a UK box?
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Old 03 November 2008, 03:15 PM
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Originally Posted by Ash911gtr View Post
Is yours a long ratio 5 speed BTW? Just checking cos i had this box installed into a 99 type r.
If someone has fitted that VN2AA box to a standard type R without changing the rear diff, then stop driving NOW. The VN2AA needs a 3.545:1 rear diff and the type R is 4.4:1 You will do several hundreds of pounds worth of damage to the centre diff, if you haven't done so already.

0.738 is the highest 5th gear available. There is a 0.77 from an obscure Legacy and then JDM anything is usually 0.825. Early RA is 0.97.

1.1:1 means that there is an under / or overdrive situation between the two shafts one is going faster/ slower than the other. IE the input shaft turns 1.1 times for every 1 turn of the other.

So, the front diff in any UK 5 speed car is 3.9:1 and the rear diff is 3.545 If you multiply 3.545 by 1.1 you get ??????? go on, you do the maths.

This is done to reduce noise/vibration/harshness by cutting down propshaft speed.

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Old 03 November 2008, 03:39 PM
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Originally Posted by RON View Post
VN = uk box, so therefore UK rear diff.....

Thats not always the case, its box specific.
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Old 03 November 2008, 04:04 PM
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Originally Posted by APIDavid View Post
If someone has fitted that VN2AA box to a standard type R without changing the rear diff, then stop driving NOW. The VN2AA needs a 3.545:1 rear diff and the type R is 4.4:1 You will do several hundreds of pounds worth of damage to the centre diff, if you haven't done so already.

0.738 is the highest 5th gear available. There is a 0.77 from an obscure Legacy and then JDM anything is usually 0.825. Early RA is 0.97.

1.1:1 means that there is an under / or overdrive situation between the two shafts one is going faster/ slower than the other. IE the input shaft turns 1.1 times for every 1 turn of the other.

So, the front diff in any UK 5 speed car is 3.9:1 and the rear diff is 3.545 If you multiply 3.545 by 1.1 you get ??????? go on, you do the maths.

This is done to reduce noise/vibration/harshness by cutting down propshaft speed.

David APi

Agents for:
Simtek, the most exciting new Ecu for years
Buddy Club exhausts
Scoobysportexhausts
Eibach suspension
Hybrid front mount intercooler kits
AP Racing brakes and clutches
And of course; the well known APi Performance Exedy organic clutch

www.apiengines.com

01926 614333
Hi, no, everything was changed, propshaft, diff, etc.
and is running without DCCD. So just to clarify, i need a
3.545 rear diff? Thanks.
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Old 03 November 2008, 04:09 PM
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Originally Posted by 172sport View Post
Thats not always the case, its box specific.
Sorry 172, I don't follow you.

ANY uk 5 speed turbo car box [ no matter 752 or 754 type ] takes a 3.545 rear diff. P1 is an exception, but that is VB type JDM box

Ron is correct in what he says UK box = UK rear diff [ Unless it is a rebuilt-for-another-purpose type box.

David.
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Old 03 November 2008, 04:09 PM
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Originally Posted by Ash911gtr View Post
Hi, no, everything was changed, propshaft, diff, etc.
and is running without DCCD. So just to clarify, i need a
3.545 rear diff? Thanks.

YUP
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Old 03 November 2008, 04:12 PM
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I run a TY755VN1AA in my wrx its front diff is 4.444 drop gears are 1.08 : 1

Yes my rear diff is a 4.111
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Old 03 November 2008, 04:14 PM
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Oh its also got and oil cooler take off too, makes sense for trackdays.
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Old 03 November 2008, 04:24 PM
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Originally Posted by APIDavid View Post
YUP
Thanks
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Old 04 November 2008, 10:29 AM
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Originally Posted by 172sport View Post
I run a TY755VN1AA in my wrx its front diff is 4.444 drop gears are 1.08 : 1

Yes my rear diff is a 4.111
That's a UK Forester box.

David
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Old 04 November 2008, 11:24 AM
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Originally Posted by APIDavid View Post
That's a UK Forester box.

David
Correct

And i bet a damn sight better looked after than an impreza, oh and cheaper to buy too

And no uk rear diff in sight. Hence my point, so be careful what your fitting. LOL
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Old 29 November 2018, 12:59 AM
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Eghan
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Default Help with rear dif match

Originally Posted by APIDavid View Post
If someone has fitted that VN2AA box to a standard type R without changing the rear diff, then stop driving NOW. The VN2AA needs a 3.545:1 rear diff and the type R is 4.4:1 You will do several hundreds of pounds worth of damage to the centre diff, if you haven't done so already.

0.738 is the highest 5th gear available. There is a 0.77 from an obscure Legacy and then JDM anything is usually 0.825. Early RA is 0.97.

1.1:1 means that there is an under / or overdrive situation between the two shafts one is going faster/ slower than the other. IE the input shaft turns 1.1 times for every 1 turn of the other.

So, the front diff in any UK 5 speed car is 3.9:1 and the rear diff is 3.545 If you multiply 3.545 by 1.1 you get ??????? go on, you do the maths.

This is done to reduce noise/vibration/harshness by cutting down propshaft speed.

David APi

Agents for:
Simtek, the most exciting new Ecu for years
Buddy Club exhausts
Scoobysportexhausts
Eibach suspension
Hybrid front mount intercooler kits
AP Racing brakes and clutches
And of course; the well known APi Performance Exedy organic clutch

www.apiengines.com

01926 614333
Hello, I own a 2001 bugeye. It has a TY754VN2AA gearbox. I understand this has a final drive of 3.9.I understand these boxes I can get:
TY754VN1AA
TY754VN1AB
TY754VN2AA
TY754VN2BA
TY754VV4AA
TY754VV5AA
TY754VW7AA
they all seem to have same gears n final drive of 3.9.

I thought the whole purpose of getting the right box is to ensure it goes with the rear dif?? So for example the TY754VBBAA has a final drive if 4.444 so I thought the rear dif must be 4.444 too!? This had me looking all over net for mine.

What i don't understand is how do u know what dif u have? There seems to be only two types r160 n r180, am I right? And mine should have a code of 27020AA050 but I've seen a gear box on the list with 4.111 final drive and 4.444 final drive have a 27020AA05 r160 rear dif code???

I'm real confused. Please can u help me understand it. I hope i made sense. What im getting at is i think i can get any of the boxes above but actually what it looks like to me is i can get any that has a r160 27020AA050 rear dif which is a LOT more boxes. Thank u
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