Nissan 'option 1' Gearbox.

[C.A.R.]

SOLD.

 

Nissan 'Option 1' Gearbox.

 

Rebuilt by Les Collins Racing.
Ex. Geoff Portman

Albins Close Ratio Gearset
Ratios are: 2.50 1st, 1.84 2nd, 1.47 3rd, 1.192 4th, 1:1 5th
Slide in tail shaft. Converted to brass syncros on 2nd, 3rd, 4th & 5th.
Crack tested gears, with new bearings, syncros and billet steel 4th/5th selector fork.
Water jet blasted cases, billet short shift gear leaver and knuckle conversion.

 

Payment: COD / Bank deposit.
Freight is available.
Contact Les Collins Racing: 03 5623 3108

 

 

Edited June 8, 2016 by Lurch ™

[gav240z]

For the uninitiated what is the benefit of the billet selector fork on 4th/5th?

[C.A.R.]

This is a bit complicated, but....

Option gearbox's were never brass syncro. They were originally steel bulk-ring.
The steel coupling sleeve that selects the gear is different to the brass syncro type selector hub.

Ordinarily this isn't a problem on a regular 71B 5-speed when converting from steel to brass syncros, BUT 4th/5th it at the FRONT of the Option gearbox AND is on a different rail.
While 2nd/3rd can use a std brass syncro fork, you can't do that with 4th/5th due to it's positioning on the rail - hence the billet fork.

(That all makes sense in my head! )

Edited May 18, 2016 by Lurch ™

[gav240z]

Understood, perhaps when I'm down at the workshop I can take a look in person and I'm sure it will make more sense.

[TomC18]

Having waited 8 years to get a 4-5 shift fork - more importantly they don't exist unless made from billet.... and without one they don't work...

 

Price $11,500?

[luvemfast]

Following on from Gav's question.

What are the differences between normal and option 1 gearboxes?

And what is the advantage of them?

 

yeah. i'm a dumbass and I could search. But would be good to have here too 

[gav240z]

I have a feeling Option 1 is emulating the ratio's available here. (Part No. 32010-N3220 - refer thread)

https://drive.google.com/file/d/0B_tGt5V5rGDVS2Zxb1EtdG1fMU0/view

[C.A.R.]

Nissan Option gearbox's were available for Rally or Race purposes.

There are Option 1, 2 & 3 all with varying ratios. They are also 'dogleg' gearbox's.

 

http://members.optushome.com.au/amaxeng/five10/gearbox.htm

Edited May 20, 2016 by Lurch ™

[dat2kman]

Hmmmm

Much better forks than original ones!

[dat2kman]

The Option box in the Fury Y s a bit of a hybrid, it ses a combo of both the Opt 1 and Opt 2 gearsets,

I think they used Peter Holinger to put it together.

Les may recall!

I have the tooth counts on file.

 

Recently sold to Pud Thompson some Option2 bits, (incomplete)

[HS30-H]

Nissan Option gearbox's were available for Rally or Race purposes.

 

There are Option 1, 2 & 3 all with varying ratios. They are also 'dogleg' gearbox's.

 

 

There was an 'Option 4' version of the F5C71-B too. Sometimes nicknamed the 'Rally Option'. I've got one in the KPGC10 at the moment.

 

One thing civilians generally don't seem to get about the F5C71-B Option 'boxes is that they are Direct Drive 5-speeds. 5th gear is 1:1, not overdrive.

 

 

 

Good luck with the sale. This one looks lovely...

[C.A.R.]

SOLD.