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Thread: 350Z Z33 Gearbox Conversion

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    Guest skinz180189's Avatar
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    350Z Z33 Gearbox Conversion

    Spent a fair chunk of today researching this a a gearbox option following the Z32 box thread of Vidal Babboon's.

    So fair, I have ascertained the following...

    For the swap you require;

    Conversion Parts
    • The gearbox, later than 03 preferably(due to crap synchros), but nothing after 08, as it seems the bellhousing pattern changed
    • Adaptor plate - Currently available from George on zilvia.net at $500 before shipping, or Mazworx sold some but aren't available on their site ATM.
    • Machined bell housing - quite large, so may be an issue for some machine shops
    • 350z slave cylinder with braided clutch line (longer clutch line, slave cylinder sits on the left hand side of the car)
    • shortened remote shifter bracket

    • Custom gearbox cross member
    • custom prop shaft - shorter, and the tail shaft yoke is the most important part. 350z have a 32 spline yoke, no other nissan's share this yoke. You may have to cut the yoke off a stock one and give it to your prop maker.
    • The gear stick hole in the chassis will need to be cut at the rear section, still works with stock interior trim.
    • Any sr clutch will work fine. You may have to modify the slave rod to suit your clutch
    • SR20DET startor motor bolts up fine.


    Gearbox Oil
    2.9l of SAE 75W-85 API GL4+, usually Castrol.

    Gear Ratios
    1: 3.794:1
    2: 2.324:1
    3: 1.624:1
    4: 1.271:1
    5: 1.000:0
    6: 0.794:1

    Maximum Speeds in each gear using a standard s14 manual diff and a 7500rpm rev limit;
    1st 39mph
    2nd 64mph
    3rd 91mph
    4th 116mph
    5th 148mph
    6th 186mph

    Speed Indication
    The Z33 gearbox has no speed sensor built in. One way around this is to use a product like this from Dakota Digital, and wire it to convert the signal from the ABS sensor on the S14 diff.

    Any further information is more than welcomed.
    Last edited by skinz180189; 22-02-2011 at 18:44. Reason: More information added

  2. #2
    Guest Drifter's Avatar
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    If I can get a box super cheap I'll have go The engine is in the shed ready to play with

    Speed wise you would probably have to take a signal from the diff ABS sensor like with a S15 box conversion

    Speed in each gear with standard S14 manual diff and 7500rpm limit...

    1 39
    2 64
    3 91
    4 116
    5 148
    6 186
    Last edited by drifter; 20-02-2011 at 21:40.

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    Strawberry 14-A VIDAL BABBOON's Avatar
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    I like the idea of having the shifter a little closer in all honesty Long legs is a PITA some times

    With taking a signal from the diff what is required to make this work ?

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    Guest skinz180189's Avatar
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    I'm quite tempted myself as I'm hard on the drivetrain, and that's before I even start learning drift. If the plates could be had for any cheaper than the US options it would really bring the cost down.

    I think the 350Z lot are starting to cotton on these have a hidden value though, judging by the prices breakers are wanting. I've been offered the box, slave cylinder, clutch fork & bearings, gear stick and prop for 600, with a 12 month no quibble warranty. Then there's obviously delivery depending where in the UK it is.

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    Quote Originally Posted by VIDAL BABBOON View Post
    I like the idea of having the shifter a little closer in all honesty Long legs is a PITA some times
    I agree it is handy, but can get on your tits when/if it squeeks against the trim

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    Guest skinz180189's Avatar
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    Quote Originally Posted by drifter View Post
    I agree it is handy, but can get on your tits when/if it squeeks against the trim
    It'll be nowhere near as annoying as my PSM downpipe, it seems the turbo flange is touching the bellhousing, making a lovely resonance

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    Quote Originally Posted by skinz180189 View Post
    I'm quite tempted myself as I'm hard on the drivetrain, and that's before I even start learning drift. If the plates could be had for any cheaper than the US options it would really bring the cost down.

    I think the 350Z lot are starting to cotton on these have a hidden value though, judging by the prices breakers are wanting. I've been offered the box, slave cylinder, clutch fork & bearings, gear stick and prop for 600, with a 12 month no quibble warranty. Then there's obviously delivery depending where in the UK it is.
    I have a new contact in the laser cutting business, probably knock out a Z32 plate for about 50

    Does the warranty cover for the fact that you will have to split the box to get the bell housing machined?
    Last edited by drifter; 20-02-2011 at 21:47.

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    Guest skinz180189's Avatar
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    Ah never thought about that, probably not. I can always ask the question.

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    Guest Phill's Avatar
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    Anyone know how similar these are too a Z32 box? Be nice to have 6 speed with the RB26 to keep it on song . . .

  10. #10
    Strawberry 14-A VIDAL BABBOON's Avatar
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    Just sent you a BBM Phil lol

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    Quote Originally Posted by Phill View Post
    Anyone know how similar these are too a Z32 box? Be nice to have 6 speed with the RB26 to keep it on song . . .
    Similar in what way?

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    Guest Phill's Avatar
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    Bell housing bolt positions etc? Missed out on a cheap box a few years box. Should have snapped it up really but couldn't find enough info on them at the time.

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    Strawberry 14-A VIDAL BABBOON's Avatar
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    Im guessing that you will have to make a plate to adapt it to the RB26 much the same as you have to with the SR

    EDIT: Here is the 350 to 200 plate

    Last edited by VIDAL BABBOON; 20-02-2011 at 21:56.

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    Guest Drifter's Avatar
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    Quote Originally Posted by Phill View Post
    Bell housing bolt positions etc? Missed out on a cheap box a few years box. Should have snapped it up really but couldn't find enough info on them at the time.
    Bolt holes look similar, there's a pic of the plate here...

    http://zilvia.net/f/drivetrain/35739...available.html

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    Strawberry 14-A VIDAL BABBOON's Avatar
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    Hmm just found this on a search !

    http://www.driftworks.com/forum/tech...-gear-box.html

  16. #16
    Guest Phill's Avatar
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    Hmmm . . . interesting.

    I'm going to do a bit of digging to see if I can track a box down. I can then CAD up the plate myself. If I can get that far i'll see if one of the local engineering firms I deal with can give me a sensible price on machining the plates.

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    I'm a bit confused by this:
    Machined bell housing - quite large, so may be an issue for some machine shops
    Do you still need the bell housing machined if you have an adaptor plate ?

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    Guest skinz180189's Avatar
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    Quote Originally Posted by folken View Post
    I'm a bit confused by this:

    Do you still need the bell housing machined if you have an adaptor plate ?
    Well I'd say so, otherwise you're moving the box backwards by the thickness of the plate.

  19. #19
    Guest skinz180189's Avatar
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    Quote Originally Posted by VIDAL BABBOON View Post
    Sounds like a pre 03 box if it had synchro issues.

  20. #20
    Strawberry 14-A VIDAL BABBOON's Avatar
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    Yeah no info on the year of the car

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