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R34 Gtr Getrag Into R33 Gtr

fomby639
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fomby639 Enthusiast

fomby639

Posted
Posted (edited)

is there nay reason why a r34 getrag gearbox wont fit into a r33 gtr?

Edit: just found the nismo conversion site. http://www.nismo.co.jp/en/products/competition/mission/getrag.html, has anyone tryed this? though it i could locate a box for a reasonable price it might be cheaper that a PPG or OS giken options

Edited by fomby639
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https://www.sau.com.au/forums/topic/357218-r34-gtr-getrag-into-r33-gtr/
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SkylineSky Rising Star

SkylineSky

Posted
Posted

there is no reason, you will have to get the original cross member for the getrag ,the R34 rear tailshaft and the front tail shaft as the getrag is 20mm longer than a 5 speed.. it will bolt straight in, You use the R33 speedo drive it will work but the speedo will be reading incorrectly as the gearing in the R34 in higher.

  • 2 weeks later...
Chris Rogers Grand Master

Chris Rogers

Posted
Posted

sorta related. I was considering dropping one of these boxes into a R32 GTS4.

given that there are several things different about them vs the old 5sp I have

what needs to change in order to fit one to a 32 chassis

I know that:

32 has cable speedo drive

driveshafts are probably the wrong length

clutch is reversed.

unsure of:

ATESSA setup (34 vs 32)

rear crossmember mounting points

----

anyone done this?

Chris Rogers Grand Master

Chris Rogers

Posted
Posted

Getrag 3.83:1

5 speed 3.214:1

Keep in mind that is just a quick search my mobile. Running 4.375:1 diffs in my car as well, so know how short first is already.

do you have a 6 spd in yours by chance? if so does the shift hole line up? ( I have just bought a full interior for my car and I'm not about to chop that up..)

heller44 Mentor

heller44

Posted
Posted

No, currently have an old r32 spec 5 speed totally missing 3rd-4th synchro, with the gts4 4.375:1 diff ratios front and rear.

Have a brand new ser3 r33 box waiting to go in on monday so will finally get to experience what everyone else takes for granted (my gearbox was on its last legs when I bought it over 4 years ago).

I can't think of any reason why you would want to fit the 6 speed instead. 5th is the same as 4th in the 5 speed (ie 1:1), and the overdrive is about the same so you don't gain longer legs for distance driving. Just have to shift more often.

A bit better search revealed:

getrag ratios

1st 3.827

2nd 2.360

3rd 1.685

4th 1.312

5th 1.000

6th 0.793

r32/33

1st 3.214

2nd 1.925

3rd 1.302

4th 1.000

5th 0.752

Knock everything into a gearing calculator like this one http://www.boosttown.com/gearbox_differential/speed_calculator.php and see what you get. The getrag with 4.11's is shorter than the 5 speed with 4.375's.

Fitting a getrag was a fleeting thought, but the hassle and extra expense to end up with something that is a curiousity was not justified.

9krpm Mentor

9krpm

Posted
Posted

My mate did this in my shed a while a go.

It's possible but you will have to massage the firewall and gearbox tunnel.

We had a hoist, a hammer or two and around 4 blokes to fit it in coz I did not have a gearbox jack atm.

Chris Rogers Grand Master

Chris Rogers

Posted
Posted

so how did it behave?

whilst I see the numbers above (and they make sense) what rpm are you doing at 100kmh?

ideally I would like to see mine at 2500ish in 6th. the idea I haev is a quick street car with highway driveability. current subaru with 4.44 rear/front diffs does it at 2800 with a 4spd auto.)

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

You could change to Stagea diffs (4.08:1 about the same as GTR at 4.1) to reduce your cruising revs. R34 GTR is 3.545:1 possibly a bit tall for you without a massive power increase (rb30/26 conversion!).

sucram Rising Star

sucram

Posted
Posted

ideally I would like to see mine at 2500ish in 6th. the idea I haev is a quick street car with highway driveability. current subaru with 4.44 rear/front diffs does it at 2800 with a 4spd auto.)

You have Subaru 4.44 ratios in your GTS4?? How did you manage to make them fit??

  • 2 years later...
30TRB Contributor

30TRB

Posted
Posted

is there nay reason why a r34 getrag gearbox wont fit into a r33 gtr?

Edit: just found the nismo conversion site. http://www.nismo.co.jp/en/products/competition/mission/getrag.html, has anyone tryed this? though it i could locate a box for a reasonable price it might be cheaper that a PPG or OS giken options

Did you end up going this way ?

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