TUnity2

I know that there are several different output shafts and that when you swap the turbo tranny in you need to swap the driveshaft/dif/axles.

I have an S4 N/A car with a welded open dif installed, I have a reshimmed S4TII chunk and output shafts that i want to install but dont want to put it in the N/A housing because I've read they are weaker and I plan on going turbo or LS so I want to get rid of it now. My questions are:

Do I have to install the S4TII chunk into an S4TII dif or can I use an S5TII?
and
When i swap the TII dif into my N/A car do I need the TII driveshaft?
and
Is there a way to identify what dif housings are what?

THANKS!

misterstyx69

iTrader: (142)

your question has just been asked recently(twice if I can recall correctly) so please look in this section.

DerekTX

from the Q&A thread:
Can I install the Turbo II transmission into an NA?

Certainly. But you need to also install:
-TII flywheel, clutch, pressure plate
-TII slave cylinder
-TII starter
-TII driveshaft, differential, axels
-Adapt the wiring.

MazdaTrix makes a TII transmission to NA rear end driveshaft, so if you don't want to swap your rear end, you can use that shaft instead.

Did my 2nd Gen RX-7 come with a Limited Slip Differential?
Only the following USA model 2nd gen RX-7s had a LSD from the factory:
86-88 GXL
87-91 Turbo
88 GTU
89-90 GTUs (however not the 89-90 GTU

TUnity2

Yea I read all that, twice.

That doesn't really answer my question. If I have a NA tranny will the TII driveshaft work? That only talks about maying a TII tranny to a NA differential.

dave1986

no, the n/a tranny spline is smaller than the turbo tranny spline.

misterstyx69

iTrader: (142)

Dave is right.
The output shaft of the N/A is smaller,so if you try to put a TII Driveshaft in,it will not fit...same with the N/A into a TII,it just won't go!
If you get the Driveshaft FOR the transmission then it's all good.it will fit.
You can always look here to get a conversion shaft already made for what you are doing.: Driveshafts

TUnity2

Ok well then I should be able to use the drive shaft I already have, I'll just swap the NA pinon flange onto the TII diff.

misterstyx69

iTrader: (142)

It will not fit as far as I know,
That is why the guys that do this mod on the cheap just elongate the holes on the driveshaft.

dave1986

Misterstyx69 is right.
Flanges are a different size also, I just finished a n/a trans to tII trans swap, n/a rear-end, and after a lot of wasted time and reseach bought a mazdatrix driveshaft($300) with replacable u joints. Bolted in smoothly, peace of mind.

TUnity2

Yea I'll probably just elongate the holes haha. I'm cheap.

TUnity2

I have a new twist on my question:

I was told the built dif chunk i bought is out of an 86 GTU with 4 clutch plates vs the later model clutch difs that came with 3 plates (then the very late models with viscous difs). Will this fit in ANY TII dif housing?

The reason I ask is because I want the turbo ring gear because I've hear the NA ones shear teeth.