S30 240Z RB26 + R34 RB25 Neo Gearbox?

[73Z]

Hello all,

 

First, I'd like to say thanks to all of the members of HybridZ, I've been reading and searching for months now, and very much appreciate all of the knowledge on this forum!  

 

I have one specific question that I wasn't able to find an answer to in my searching.  It seems that Nissan still makes the RB25DET NEO gearbox for the R34 - Part number 32010-AA520.

 

Has anyone successfully used this gearbox in an RB26/S30 swap?  I saw many mentions on this site of using the R33 version of this box, but wasn't sure if there are any specific differences on the 34 Neo version other than push/pull clutch?  I assume either clutch config would work.  I was unsure if there are any physical case size differences,  or if the shifter will land in the correct place.

 

I have a 1973 Z, so I know I will need to modify the trans cross member ears in the tunnel, but that's all I am currently expecting for fitment (other than custom driveshaft).

 

Thanks all!

73Z

[Zetsaz]

The transmission is honestly the more brain melting part of some swaps. There are lots of options, all with their own pros and cons. I think for a long time most people were using the Z32 transmissions. They were the same as the ones used behind rwd Skylines, and the TT and NA versions of the transmission were the same iirc. 

 

These days most people will opt for that or the CD009/CD00A. There's more support, it's 6 speed, it's stronger, and likely cheaper, but mounting it is slightly more difficult and less space. 

Do you already have the engine? Getting one with a manual raises the cost considerably compared to just getting the engine, which is why a lot of people just opted for the Z32 trans in the states (until the later CDxxx transmissions became more widely available).

My understanding of the R34 rwd trans, based on some info from australian forums is you'll likely have to switch the clutch type by drilling and tapping into the R34 bellhousing, or just swapping it with an R33 bellhousing. I'm honestly not sure it's worth the trouble of getting a brand new R34 trans and dealing with adapting it and mounting it when there's so much more support for the later 6 speeds, and still decent support for the Z32 trans, both of which will hold whatever power you want to throw at them, likely at a lower cost. 
 

[73Z]

8 minutes ago, Zetsaz said:

The transmission is honestly the more brain melting part of some swaps. There are lots of options, all with their own pros and cons. I think for a long time most people were using the Z32 transmissions. They were the same as the ones used behind rwd Skylines, and the TT and NA versions of the transmission were the same iirc. 

 

These days most people will opt for that or the CD009/CD00A. There's more support, it's 6 speed, it's stronger, and likely cheaper, but mounting it is slightly more difficult and less space. 

Do you already have the engine? Getting one with a manual raises the cost considerably compared to just getting the engine, which is why a lot of people just opted for the Z32 trans in the states (until the later CDxxx transmissions became more widely available).

My understanding of the R34 rwd trans, based on some info from australian forums is you'll likely have to switch the clutch type by drilling and tapping into the R34 bellhousing, or just swapping it with an R33 bellhousing. I'm honestly not sure it's worth the trouble of getting a brand new R34 trans and dealing with adapting it and mounting it when there's so much more support for the later 6 speeds, and still decent support for the Z32 trans, both of which will hold whatever power you want to throw at them, likely at a lower cost. 
 

Thanks for your response.  I saw similar things about needing to re-drill for a push type clutch, but I am not even sure this is strictly necessary (if you are OK with running the pull.  My RB26 came with a pull type clutch anyways on the GTR/AWD gearbox.  

 

My understanding (that I am hoping to confirm here) is that the R34 NEO RB25 5 speed wouldn't be much adapting at all.  It might just bolt right up (bell housing side) and need a custom cross member mount, and that's really it?  But I was hoping someone could confirm if it fits the tunnel, etc.