Gearbox Identification - 280Zx

[Blue Z]

Hi Guys,

 

Hoping that you can help and provide the gearbox ID number for this box?

 

It was from a 280zx with 5 speed manual from about 1978.  I am looking at one of the Kameari close ratio kits and just want to make sure I pick the right one for this gearbox.

 

Thanks for your help, Blue Z

[C.A.R.]

Rough-cast early extension housing & the filler plug on the RHS suggests it's a 260Z gearbox, 

HOWEVER as it looks like it's been apart before (notice the red sealer between the sandwich plate) I can't confirm 100%.
You'll need to pop the cases off, see which syncro rings it has & check the ratios.

If you are going to build a gearbox with a Kameari gear-set, the ones available for the early 71B gearbox's still don't have the best ratios.

 

Depending on what year your Z is(?), I suggest you fit a  S13/S14 gearbox if your's is a early 240Z, or R31/R32 Skyline gearbox if you have a later 240 or 260Z with these ratios:

 

- 1st: 2.427
- 2nd: w1.677
- 3rd: 1.258
- 4th: 1.000
- 5th: 0.759

 

HTH,

L.

[Cozza]

Hey Lurch

What's the difference between S13/S14 and R31/R32?

Shifter location?

 

Cheers

Mick

[C.A.R.]

Hey Lurch

What's the difference between S13/S14 and R31/R32?

Shifter location?

 

Cheers

Mick

Yes - the R31/R32 gearbox's are about 45mm shorter in the shifter location compared to the S13/S14 units.

Mainshaft is also shorter by a similar amount.

Also, fitting a 71C gearbox into a Zed does require modification to the gearbox crossmember.

 

Basicly, if you have a early Z that has the vertical bolt holes in the transmission tunnel to mount the gearbox crossmember, you need to fit a S13/S14 gearbox.

If you have a later Z with the Horizontial bolt holes in the gearbox tunnel to mount the transmission crossmember, you use a R31/R32 gearbox.

 

Edited August 18, 2016 by Lurch ™

[dat2kman]

You still need to modify the box crossmember, and tunnel tabs, in a later Z to fit both C type boxes.

 

I have around 6 off, S13/S14 boxes that are very suitable for a Kameari conversion.

The C boxes have thicker mainshaft, wider gears compared to older B boxes.

 

You need to just source and mdify the L series bellhousing, to then fit the C type back end.

[Blue Z]

Hi Lurch and Dat2man,

 

Thanks very much for the feedback,  so based on this being 71B,

 

I assume this will be the close ratio set for the gearbox?

" L-Type: Only for FS5W71B Transmission type. HR31: Only vehicles before 8/87 Get this and all your JDM at RHDJapan!"

 

http://www.rhdjapan.com/kameari-super-close-gear-set-l-type-fj20et-hr31-zenki.html

 

Which would provide these ratios:-

1st: 2.624

- 2nd: 1.814
- 3rd: 1.360
- 4th: 1.000
- 5th: 0.813~0.93

[dat2kman]

That is dependant on your input drive/driven ratio, mst 71B's are 1.409, some are 1.53

Early 71A some had 1.409, others 1.25

 

Tye gears that Kameari supply, are all the same tooth count, for both B and C gearsets.

 

To know just what you are going to end up with, you do need to pop the bell off, and do a tooth count, use liquid paper to put a white mark on a tooth, rotate by hand, count carefully.