Transmission Comparison RB25DET vs. VG30DETT.

Post by **Kansei240sx** » Fri Aug 25, 2006 8:20 am

I would still have to disagree with that on a certain note becuase it doesnt have the short stubness of a Z32 anything... The shifter sticks right out of the thing and lines right up to my shifter hole perfectly, and N/A Z32 transmission have a weird shifter fork and mount plate for it with a goofy collar like thing between the fork.

I have come to the conclusion that i may have a Manual RB25DE transmission from an R32/R33 or some other Sedan. The tranny didnt come mated to the motor.

Post by **gawdzilla** » Wed Oct 04, 2006 12:22 pm

reviving this thread for obvious reasons. any chance of getting the rear casing to bolt on to the vg30dett trans?

how can the shifter components of the 25 trans be transplanted over?

Post by **s14 2510's** » Thu Oct 05, 2006 2:30 am

What i want to know is are the 300zx internals the same as the rb25det trans. If i trash my 25 trans can i pull it apart and swap the broken internals for the 300zx internals. Are the syncros and gear set the same from 300zx to rb25det?

Post by **gawdzilla** » Thu Oct 05, 2006 3:55 am

i checked FAST yesterday, all the little gears/shafts/random clips, and they all are identical to the TT trans. didnt check vs the NA trans.

However, the striking rods/shifter portions are different. The forks are the same but the layout/length of the rods is different. Its most likely possible to take the rods from the 25 trans and transplant them into the tt trans though... since those arent usually what break

Post by **gomer23** » Thu Oct 05, 2006 4:10 am

As far as I knew DETurbine was having good luck so far transfering stuff around. I am sure he will post soon with an update on his progress.

Post by **gawdzilla** » Thu Oct 05, 2006 4:25 am

gomer23 wrote:As far as I knew DETurbine was having good luck so far transfering stuff around. I am sure he will post soon with an update on his progress.

yea.. seems like he is just swapping the front bellhousing over, which still requires a custom ds and modifying the tranny tunnel. i'm hoping i can swap the rear bellhousing and shifting forks/rods over as well and the guts from z32 tt..

Post by **MadMax670** » Thu Oct 12, 2006 9:47 am

Anyone know the gear ratios of the RB25 tranny? And the stock 240 differential? Thanks!

Post by **gawdzilla** » Thu Oct 12, 2006 3:11 pm

don't know, but the trans on a stock 240 pinion is really tall geared. 200mph gearing @ ~8k rpm

Post by **kouki munster** » Thu Oct 12, 2006 7:57 pm

MadMax670 wrote:Anyone know the gear ratios of the RB25 tranny? And the stock 240 differential? Thanks!

This is for the 300zx but the rb25 has the same gearing

And the 240 diff ratio is 4.08:1.

Post by **John Bristot** » Sun Dec 10, 2006 3:07 pm

Ok. Someone please answer this for me. Will the VG30dett tranny mount up to the RB26dett motor?

Post by **BoostFab** » Sun Dec 10, 2006 3:13 pm

not directly bolt on affiar, you will need to swap out the bell housing.

Post by **240z4u** » Sun Dec 10, 2006 7:19 pm

If anyone cares to see a z31 turbo 300zx transmission with an RB26 bellhousing on it I swapped it into my car about a year and a half ago. There are a few photos on racebread.com but if your having trouble identifying your trans I can send you pics (or send them to me) and maybe i can identify it for you.

Evan

Post by **John Bristot** » Mon Dec 11, 2006 2:26 am

Yes i would like to see your pics. Also where did you get the RB26 Bellhousing? Thanks for the info. Because if i can get together a 300zx tranny and hook it up to the RB26 and find the bellhousing im mind will be made up on what engine i get.

Post by **240z4u** » Mon Dec 11, 2006 3:48 am

Bellhousing came on the front of the RB26 tranny that I got screwed and stuck with.

Lesson learned, go with reputable sources and go full clip. Its worth the money in the end.

I will try and get some photos this week, it may be the end cause I am working two shifts a day until thursday.

Post by **John Bristot** » Mon Dec 11, 2006 4:04 am

Thats cool. If i went with a clip what is in there that i need from it? I dont want to get stuck with things that i dont need/want in my garage. but if it best ill go with it.

Post by **Scott Buwalda** » Mon Dec 11, 2006 4:47 am

I am in the same predicament as John. I have an RB26DETT (see signature). My RB30 box is toast, and needs to be replaced. I have the OEM RB26DETT transmission sitting here, unused. So, I can take the bellhousing off my RB26 transmission, attach it to a Z32 TT transmission, and it will bolt right up? The only thing is a new driveshaft, and cutting the tunnel a little bit for the new shifter position? If so, that's a done deal. Off to eBay to find a TT Z32 box.

Scott

Post by **John Bristot** » Mon Dec 11, 2006 5:37 am

hey Scott, you might just wanna call Z1 in GA. you could just drive there and get one. ithey have lots of spare parts. you can go to z1performance.com

Post by **John Bristot** » Mon Dec 11, 2006 5:45 am

Also Scott, we you being somewhat close to J-Ville. Maybe i could get some input from you about doing this RB26 swap.

Post by **74260zt** » Mon Dec 11, 2006 6:23 am

Hi Evan,

240z4u wrote:If anyone cares to see a z31 turbo 300zx transmission with an RB26 bellhousing on it I swapped it into my car about a year and a half ago. There are a few photos on racebread.com but if your having trouble identifying your trans I can send you pics (or send them to me) and maybe i can identify it for you.

Evan

Hi Evan, I just picked up a 88-89 Z31 turbo box for the reason your posting about, mating it to a RB bell.

I think that swap would be easier than the Z32 trans/RB bell swap because of the shifter location.

Could you please send me some pics of your Z31 trans/ RB bell swap??

thanks - joel

** Edited email address***

j.

Modified by 74260zt at 10:47 PM 2/15/2007
Modified by 74260zt at 3:29 AM 12/15/2008

Post by **74260zt** » Thu Feb 15, 2007 6:50 pm

*** Bump ***

Evan.... you still around?

Please help me out with those pics of the Z31 turbo / RB25det trans

Post by **Sky80** » Thu Feb 15, 2007 10:37 pm

^^^ Sweet pics, clean Z..

Post by **FAST-DATSUN** » Fri Feb 16, 2007 6:59 am

the VG will not mount up with out mods or a adapter.

Post by **Methods** » Fri Feb 16, 2007 11:10 am

74260zt

What turbo setup is that? How much did that cost you? whats the power output and where did you get them from. Sorry for the offtopic questions but im about to do a rb26dett swap into my 240sx and i wanna replace the stock twins.

Post by **Methods** » Fri Feb 16, 2007 11:17 am

Also what manifolds are those and is the downpipe custom?

Post by **RB26needaparachute** » Fri Mar 30, 2007 2:40 pm

Is the rb20det and the rb25det bell housings the same?If not do any of you have one for sale?Thanks

Post by **DETurbine** » Sun Apr 01, 2007 7:05 am

The RB20 transmission bellhousing where it bolts up to the back of the block should be the same, but as far as if the RB20 bell housing will bolt up to the VG rear housing, I highly doubt it. The RB20 transmission is quite a bit smaller then the RB25 and VG30 transmission. I bet you could use the RB20 bellhousing on the Z31 transmission though.

Also, for those that wanted to know, I swapped the RB25 bellhousing onto the VG30 transmission with no problem. Took a good 45min .

Post by **USsil80** » Sun Apr 01, 2007 12:13 pm

DETurbine wrote:
Also, for those that wanted to know, I swapped the RB25 bellhousing onto the VG30 transmission with no problem. Took a good 45min .

umm pics please.. everything that i have ever read said that it wouldn't bolt up...

Post by **Thrwnsprkz** » Thu May 24, 2007 6:03 am

this thread is very helpfull, but i would like to know one thing, does anyone have any experience or know if the internals, (gears) from a vq30dett tranny could be transplanted into an rb25det tranny to rebuild it. My friends rb25 tranny just crap out on him and he was wondering this...any help with greatly appreicated

Post by **kouki munster** » Fri May 25, 2007 8:38 am

The z32 tranny (vg30dett, vg30de) is the same internaly as the rb25.

Post by **URAS** » Sun May 27, 2007 11:24 pm

The push type RB25 and RB26 (early) bellhousings are all the same, so are all the pull type belhousings (late).

I hate the shifter setup on the 300zx gearbox and its orientation. i prefer to use the R34 gearbox's as they have less kms. The late ones are all pull type so i swap them over to push type bellhousings because i hate pull clutches (less reliable).

For serious guys i use the GTR box with a modified transfer, by using this setup the output shaft is supported by an extra 3 bearings and tends to last a little longer in extreme conditions.

see pic of modded transfer

Transmission Comparison RB25DET vs. VG30DETT.

Re: Transmission Comparison RB25DET vs. VG30DETT. (DustinZ)

Re: (gawdzilla)

Re: (s14 2510's)

Re: (gawdzilla)

Re: (gomer23)

Re: (gawdzilla)

Re: (MadMax670)

Re: Transmission Comparison RB25DET vs. VG30DETT. (DETurbine)

Re: (BoostsFed)

Re: (240z4u)

Re: (John Bristot)

Re: (240z4u)

Re: (John Bristot)

Re: (Scott Buwalda)

Re: (John Bristot)

Re: (240z4u)

Re: (74260zt)

Re: (FAST-DATSUN)

Re: (Methods)

Re: Transmission Comparison RB25DET vs. VG30DETT. (DETurbine)

Re: (DETurbine)

Re: (USsil80)

Re: (Thrwnsprkz)

Re: (DETurbine)

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