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  1. #1
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    Geabox Conversion Help

    Hi all,

    I need help in gearbox conversion, Genuine Help i mean, I been reading for the conversion for quite sometime. but still stuck in a stage of choosing between Z32 (5spd), Z33 (6spd), S14 (5spd)


    I am driving a Nissan Silvia S15,daily street driving & randomly launching or drifting throughout times, I am running around 320hp, with Nismo GT L.S.D Pro TT. Currently running a S14 Gearbox. Previously blown one S13 gearbox.


    1. Strong and longer lasting Gearbox


    2. usually Is the gearing and syncro already repair by the seller? or is it a luck thing on the use gearbox?


    3. which gearbox will you actually recommend? Z32 (5spd) or Z33 (6Spd) (i am tired of replacing gearboxes already after recent S14 gearbox up for less than 4mths. started to have sound inside already


    4. During the time when i am with S13/S14 gearboxes, everytime when i release throttle and speedo starting to drop from 100km/h down, everytime it passes the 90-80km/h (2.2 - 2.4rpm) it will have a noise (either i will called it a tramping or gearing noise) then back to normal again. If i uses the Z32/33 Gearbox and uses back the S15 clutch set & dual mass flywheel. does it solve the NVH?


    5. Do i need cutting of any chassis area with the above mention gearbox?


    6. Using back dual-mass flywheel better or single mass flywheel (lke stock S14) is better?


    7. 5spd or 6spd is better for both driveability and drifting. I actually want something responsive & fun to drive/drift.
    (5 or 6 spd is actually best for drifting?)

    8. is the shifting feel the same as S14 (5spd)/ S15 (6Spd) with the Z32(5spd)/Z33(6spd)

    9. Thank you guys


    • 0




  2. #2
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    Ok, the Z32 gearbox is a popular conversion here in Australia. You will need a bell housing adaptor plate which I know you can source them through a company call ALPHA OMEGA Racing here in Australia..You will have to cut the gear lever hole in the tunnel as it sits back further.. I would recommend a new Exedy clutch and flywheel, the stock clutch and dual mass are really not up to the power even though it will reduce your NVH..The gear box will sit in the tunnel you will have to get another cross member and bushes..

    The Z33 is a very nice gearbox but requires a lot more bashing of the tunnel area due to its larger size..It is newer and maybe a little stronger than the Z32 but you will pay a bit more...If you can buy a new Z32 box it would be better than a second hand one but you should be able to find a good one.

    The diff ratio you chose will have a bearing on the final drive ratio and wether you want sharp acceleration or top end speed

  3. #3
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    1. Strong and longer lasting Gearbox
    Both plenty strong enough, but both have potential synchro problems on early boxes. If you're managing to break boxes on only 320bhp that doesn't bode well for any box tbh.


    2. usually Is the gearing and syncro already repair by the seller? or is it a luck thing on the use gearbox?

    Pot luck with second hand, only way to be sure is to buy new. I bought my Z32 from Coz Performance in the US.


    3. which gearbox will you actually recommend? Z32 (5spd) or Z33 (6Spd) (i am tired of replacing gearboxes already after recent S14 gearbox up for less than 4mths. started to have sound inside already
    Can't say, Z32 has always done me well, but I have still had to repair synchros (changing into 5th at 8k revs puts a bit of strain on them). Z33 boxes seem a lot more expensive, never driven one though.


    4. During the time when i am with S13/S14 gearboxes, everytime when i release throttle and speedo starting to drop from 100km/h down, everytime it passes the 90-80km/h (2.2 - 2.4rpm) it will have a noise (either i will called it a tramping or gearing noise) then back to normal again. If i uses the Z32/33 Gearbox and uses back the S15 clutch set & dual mass flywheel. does it solve the NVH?

    Pretty sure you can't use the dual mass with the Z32, so if the noise is NVH it'll still be there. you tend to get more noise with the conversions anyway as you'll be using stiffer/solid mounts.

    5. Do i need cutting of any chassis area with the above mention gearbox?
    Just need to massage the tunnel back for the Z32 and cut a small bit out of the tunnel for the shifter.


    6. Using back dual-mass flywheel better or single mass flywheel (lke stock S14) is better?
    As above, Z32 can't use dual mass afaik, Z33 might be okay.


    7. 5spd or 6spd is better for both driveability and drifting. I actually want something responsive & fun to drive/drift.
    (5 or 6 spd is actually best for drifting?)
    Never missed the 6th gear in mine, goes well on track. I dropped the diff to a 4.1 ratio which helps as the 5th in the Z32 is very long, too long with a 3.6 diff.


    8. is the shifting feel the same as S14 (5spd)/ S15 (6Spd) with the Z32(5spd)/Z33(6spd)
    Some of the aftermarket shifters are **** and rattle a lot. I used a genuine Nissan shifter on my Z32 which is much better.

    9. Thank you guys
    No problem

  4. #4
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    Quote Originally Posted by Auss15 View Post
    Ok, the Z32 gearbox is a popular conversion here in Australia. You will need a bell housing adaptor plate which I know you can source them through a company call ALPHA OMEGA Racing here in Australia..You will have to cut the gear lever hole in the tunnel as it sits back further.. I would recommend a new Exedy clutch and flywheel, the stock clutch and dual mass are really not up to the power even though it will reduce your NVH..The gear box will sit in the tunnel you will have to get another cross member and bushes..

    The Z33 is a very nice gearbox but requires a lot more bashing of the tunnel area due to its larger size..It is newer and maybe a little stronger than the Z32 but you will pay a bit more...If you can buy a new Z32 box it would be better than a second hand one but you should be able to find a good one.

    The diff ratio you chose will have a bearing on the final drive ratio and wether you want sharp acceleration or top end speed

    HI Auss15

    I tot i saw the alpha omega site said that no need to cut anything for the shifter?

    My diff is 4.11 if i rem correctly. the Z33 is big enough to actually go lower than the chassis rail right? If it is then i wont be able to get it, as my country have alot of weird hump. sometime i already scratching my cat below. LOL

    just a question, which would you prefer to drive with Z32 / Z33 for daily drive and occasional drifting/launching/spinning off? LOL

  5. #5
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    Quote Originally Posted by drifter View Post
    1. Strong and longer lasting Gearbox
    Both plenty strong enough, but both have potential synchro problems on early boxes. If you're managing to break boxes on only 320bhp that doesn't bode well for any box tbh.
    (I believe my recent boxes is already not in condition when i bought it, the first one gave me a couple of years till its gone)

    2. usually Is the gearing and syncro already repair by the seller? or is it a luck thing on the use gearbox?

    Pot luck with second hand, only way to be sure is to buy new. I bought my Z32 from Coz Performance in the US.


    3. which gearbox will you actually recommend? Z32 (5spd) or Z33 (6Spd) (i am tired of replacing gearboxes already after recent S14 gearbox up for less than 4mths. started to have sound inside already
    Can't say, Z32 has always done me well, but I have still had to repair synchros (changing into 5th at 8k revs puts a bit of strain on them). Z33 boxes seem a lot more expensive, never driven one though.
    (Z33 also have synchro prob?)

    4. During the time when i am with S13/S14 gearboxes, everytime when i release throttle and speedo starting to drop from 100km/h down, everytime it passes the 90-80km/h (2.2 - 2.4rpm) it will have a noise (either i will called it a tramping or gearing noise) then back to normal again. If i uses the Z32/33 Gearbox and uses back the S15 clutch set & dual mass flywheel. does it solve the NVH?

    Pretty sure you can't use the dual mass with the Z32, so if the noise is NVH it'll still be there. you tend to get more noise with the conversions anyway as you'll be using stiffer/solid mounts.
    (Roger that)

    5. Do i need cutting of any chassis area with the above mention gearbox?
    Just need to massage the tunnel back for the Z32 and cut a small bit out of the tunnel for the shifter.


    6. Using back dual-mass flywheel better or single mass flywheel (lke stock S14) is better?
    As above, Z32 can't use dual mass afaik, Z33 might be okay.


    7. 5spd or 6spd is better for both driveability and drifting. I actually want something responsive & fun to drive/drift.
    (5 or 6 spd is actually best for drifting?)
    Never missed the 6th gear in mine, goes well on track. I dropped the diff to a 4.1 ratio which helps as the 5th in the Z32 is very long, too long with a 3.6 diff.

    (just a question, which would you prefer to drive with Z32 / Z33 for daily drive and occasional drifting/launching/spinning off? LOL)
    Z33 with FD 4.11 or Z32 with FD 4.11 is actually better and fun to drive with?

    8. is the shifting feel the same as S14 (5spd)/ S15 (6Spd) with the Z32(5spd)/Z33(6spd)
    Some of the aftermarket shifters are **** and rattle a lot. I used a genuine Nissan shifter on my Z32 which is much better.

    9. Thank you guys
    No problem

  6. #6
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    Yeah, early Z33 have the same issue. For Z32 ideally you want a 1998+ box, Z33 you need a CD09. Bare in mind though if you buy an early Z32 and the 3rd gear synchro fails you'll have to buy the complete gear which was around 500 in parts when I last looked.

    As for comparing between the 2, I can't say as I've only ever used the Z32

    Have a look here, this is my thread when I first fitted the Z32 back in 2006, albeit onto my S14a at the time, but it's the same for the S15. Only thing that's easier on the S15 is the speed sensor, as it comes from the diff you don't need to convert the signal.

    Here we go, Z32 gearbox

  7. #7
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    The Z33 is a nice box to use, I drove one and I liked the short shifts but you will probably find you will hardly use the 6th gear because it is so tall..

  8. #8
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    Quote Originally Posted by drifter View Post
    Yeah, early Z33 have the same issue. For Z32 ideally you want a 1998+ box, Z33 you need a CD09. Bare in mind though if you buy an early Z32 and the 3rd gear synchro fails you'll have to buy the complete gear which was around 500 in parts when I last looked.

    As for comparing between the 2, I can't say as I've only ever used the Z32

    Have a look here, this is my thread when I first fitted the Z32 back in 2006, albeit onto my S14a at the time, but it's the same for the S15. Only thing that's easier on the S15 is the speed sensor, as it comes from the diff you don't need to convert the signal.

    Here we go, Z32 gearbox
    Noted with that but is there any exterior differences or no. that diff the 1998+ away from older version?

    How is the feel for the Z32? Fun to drive? Torquey?

  9. #9
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    Quote Originally Posted by Auss15 View Post
    The Z33 is a nice box to use, I drove one and I liked the short shifts but you will probably find you will hardly use the 6th gear because it is so tall..
    Is it more torquey than the Z32?

  10. #10
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    Quote Originally Posted by Shawnhalu View Post
    Is it more torquey than the Z32?
    If you mean stronger, I'm not sure...it is a newer style box and it is in a car with more power than the Z32 but like any stock gearbox they are built to run in a stock power plant...when you start modifying cars with more power you will compromise any stock gear box..

    Serious powered cars are better to use some form of racing gear box, like Hollinger...

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