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OS giken 26 spline input shaft compatibility

SiR_RB
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SiR_RB Grand Master

SiR_RB

Posted
Posted (edited)

Hopeing someone can help me out here, 

so I have a 1-3 PAR straight cut synchro gearset, with standard input shaft/4th gear and standard 5th 

 

my question is, can the OS giken updated 26 spline input shaft be used with factory 4th gear ? Or specifically only for OS gearsets?

 

here’s a pic of the OEM item and OS item 

 

4275C9AA-7BAB-40A5-BCD4-8551EA708074.png

07DBCDD0-47B8-4962-A2DA-90250531D0B4.png

Edited by SiR_RB
BK Grand Master

BK

Posted
Posted

No it won't, I'm sure they use a different tooth count and angle on the helical input with PAR and PPG synchro gearsets. It's all to do with the counter shaft gear which OS giken matches to the standard Nissan profile. You can use a stock Nissan input on an OS gearset, or an OS reinforced input on a stock box (not that you ever would).

Also be careful with ''reinforced input shaft", as OS giken do a reinforced input shaft in both standard Nissan 24 spline and GM 26 spline. PM me if you want to know more, but an OS giken uprated shaft even in 26 spline is still much smaller before the spline on the shaft area, than say a PPG or PAR 26 spline input shaft is.

You have a PAR gearset, you need a PAR 26 spline input shaft.

  • Like 1
BK Grand Master

BK

Posted
Posted

So yeah in your case the 24 spline 25.4mm section itself is the weakest part as opposed to a stock or even OS giken uprated shaft having its weakest part before the spline.

So even your 24 spline input is still a pretty beefy shaft 👍

  • Like 1
  • 2 weeks later...
  • 2 years later...
Roy Grand Master

Roy

Posted
Posted

So digging  this thread up. Why would I do the GM 26 spline if doing  a full OS Giken gearset in an RB25 box?

I am pretty easy on gearboxes generally having never blown one. My current box has had gear on gear contact so now has very loud whining noise so need new gears

 

Not sure ro go 34 gtt box or rebuild with OS Giken gearset

https://youtu.be/N1N7eQEC1N0?feature=shared

 

 

 

 

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