[Clrs]

Hello.
It is well-known that a standard getrag input shaft tends to twist if car is launched from high revs. At the same time supras never twist it even if launched on slicks and even on glue. These transmissions have a lot of common parts, even a repair manual from supras is used to repair BNR34 getrags. What if we take this input shaft from Toyota V160 and put it to our getrag? Yes, we would need to use a different clutch and some drifters proved it would fit. Nismo 26 spline costs heaven and hard to find, while supra's shaft is $100. Supra's shaft is 14 spline and a lot thicker.
What are your thoughts?

 

[ANDY H]

Be easyer to get than a nismo shaft!
I have both a nismo shaft and a standard shaft! If anyone has the dimentions of a supra shaft ill do my two!

 

[Jimbostir]

I thought nismo ones were the same as Toyota ones?

 

[Jimbostir]

Or is that hollinger?

 

[Clrs]

I thought nismo ones were the same as Toyota ones?

Definitely no. Toyota's spline is 14 teeth and 30.8 mm thick (I guess). Stock BNR34 getrag has 24 teeth spline while Nismo is 26. And both are thinner than Supra's.

 

[Clrs]

Found the following data:

Supra V160/V161 - 14 spline 30.8mm thick.
BNR34 stock getrag - 24 spline 1 inch (2.54cm) thick
Nismo input shaft - 26 spline. Don't know how thick.

 

[Jimbostir]

Right so you'll have to change the friction plates to Toyota ones.

 

[Clrs]

Right so you'll have to use the friction plates to Toyota ones.

Right. But a lot of drifters use supra getrags with RB25/RB26 engines, so I guess crankshaft bolt pattern is the same or can be modified?
The problem with Nismo shaft is not only it is expensive and hard to find, but you have to use just a couple of clutch kits like Nismo GMax or OSGiken for 26 spline (does it fit?). If you want to use a carbon clutch f.e., what to do?
If Toyota input shaft fits we can use a lot of different clutches with no problem.

 

[Jimbostir]

Makes sense. Just got to find out what flywheel they use. Why not email exedy and ask? They will know the PCD on both the flywheels

 

[Clrs]

Found Nismo info. It is 27.5mm x 26 teeth.

 

[ANDY H]

Nismo spline and a Toyota shaft are the same diameter and spline number! The same as the holinger.

 

[Clrs]

Nismo spline and a Toyota shaft are the same diameter and spline number! The same as the holinger.

Absolutely wrong. Toyota is 100% 14 spline and 30.8mm dia.

 

[Clrs]

According to drifters, crankshaft bolt patterns are the same but is not confirmed yet.

 

[Clrs]

So, final data:

Getrag from Supra: 14 teeth and 30.8mm dia.
Stock getrag from BNR34 - 24 teeth and 25.4mm.
Nismo clutch -26 teeth and 27.5mm.
Crankshaft bolt patterns seems the same, so a clutch from 2JZ can bolt on to RB26.
So, the idea can be useful, need to check

 

[ANDY H]

Bit funny that as I used a Toyota input shaft to line up my hollenger splined clutch!

 

[ANDY H]

As I'm at home at the moment I can't check the shaft size or teeth number!

 

[Clrs]

Bit funny that as I used a Toyota input shaft to line up my hollenger splined clutch!

It's a stock clutch from 6 speed Supra. You can count by yourself:

 

[Clrs]

Aaaaahhh, the world is not that simple :-(
2JZ has 8 bolts on crankshaft, while RB26 six :-(
Drifters are making some soft of adapters. :-(

Stock 2JZ flywheel:

And BNR34 flywheel:

Epic fail :-(

 

[FRRACER]

The supra centre plate with its 14 tooth does look a lot stronger. Wonder why Nissan went for a weaker design bearing in mind that the 4wd system would put more load during a hard launch, was it so they could then try and sell an uprated item for more money?

 

[nailsgtr600]

We've been running a supra input spline for a few years on one of our cars...