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FJ20t gear ratios


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#41 Gareth. J.

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Posted 28 June 2013 - 08:28 PM

I have RB20DET gearbox bearing part numbers if anyone needs them in the future they are,

Counter shaft front: NSK 25TM15U1 (sealed bearing)
Counter shaft centre: NSK HR6305
Counter shaft rear: Nachi NUPK204

Main shaft front: NTN TMB306CNXC3 (sealed bearing)
Main shaft centre: NTN 6306CC3 japan RS
Main shaft rear: NSK TM205U40A (sealed bearing)

#42 Gareth. J.

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Posted 30 June 2013 - 07:56 PM

Can anyone tell me what I'm missing from the shifter mechanism? It looks like maybe a circlip and a spring or bush?

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#43 dat2kman

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Posted 30 June 2013 - 09:19 PM

There should be a loose internal circlip that sits on top of the upper white plastic ring.
Also under the rectangular shift plate cover, a detent ball and spring, held in by a bolt, head is larger than others, it is a wpecific length.

#44 NZeder

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Posted 19 July 2013 - 06:01 PM

OK thought I would open this discussion some more. So I picked up an fj20 box that I will pull apart soon and use this as the build for a strong track 71b box using new gear set.

I used to own (and one Datsun I should not have sold...cool and very different) a Datsun 160jsss 710 that had a factory fitted dogleg 63a 5SP.

The layout is like this
R..2..4
|--|--|
1..3..5

I liked this dogleg layout and think it is great for a track car as 2345 are mostly used gears aka in the H pattern. This box was an overdrive box not a 1:1 5th.

I might even see if I can pickup one of these 63a doglegs to see if the selector setup can be replicated in a 71b box as they have a very similar tail/selector design.

Does anyone know if that is even possible?

Cheers Mike


#45 Gareth. J.

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Posted 19 July 2013 - 11:37 PM

It's a great shift pattern, I had the same shift pattern in my first car, a Datsun 1600. Was great for ripping through the gears.

I have contacted pfitzner about the sandwich plate oil mod as they are virtually the same as SR20 boxes, no reply yet.

I'll post the RB rebuild in my build thread.

#46 NZeder

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Posted 21 July 2013 - 05:57 AM

OK so I studied the parts catalogs that shows the selector setup. This is what I have worked out.

The 3 selector rods are for each bunch of 2 gears. In a standard 5spd pattern this is how they are laid out.

Top rod = 1 & 2 selector
Middle rod = 3 & 4 selector
Bottom rod = 5 & reverse both of  these are in the tail if the box

The dog leg is like this
Top rod = reverse & 1 both in the tail of the box and in the reverse order to the standard box.
Middle rod = 2 & 3
Bottom rod = 4 & 5

That is comparing the 63a dogleg selector controls to the 71b selector controls.

So it could be possible but complete new internals will be required. Ie new top selector rod and leaver, new reverse gear and new first in the rear and reverse order to stock. The same in the front ie new selector rods and forks and all new gears in the ratios required keeping the 1:1 as 5th gear.

So a lot of work :(

#47 NZeder

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Posted 21 July 2013 - 06:04 AM

A local racer here has a holinger 71b dogleg 1:1 5th dog engagement box (I think all new internals) might have to see inside that box one day and see if it can be replicated.

#48 d3c0y

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Posted 21 July 2013 - 09:53 PM

That would be super cool! Awaiting picks!

#49 dat2kman

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Posted 21 July 2013 - 10:30 PM

That would be super cool! Awaiting picks!

I got some pics,,, somewhere,, of the Nismo Option 1;1 box in the 120Y
Yes its a FJ jobbie, with the proper dogleg shift.
It runs dog engagement instead of synchro rings.

#50 d3c0y

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Posted 22 July 2013 - 08:49 AM

We know what you are like with getting pics up on the forum though haha.  ;D

#51 Gareth. J.

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Posted 22 July 2013 - 06:52 PM

PPG/Pfitzner offer gearsets but they state on the website no warranty unless the sandwhich plate is modified to stop oil starvation on sr20 which is the same as rb20, is this a worthwhile mod (see pic)? I have it out so it's easy to do.


Here's the email I got back from them today.
"Reply from pfitzner PPG....
"Hello Gareth,

Any holes that can be blocked below the oil the level line should be; for drift application..

It is recommended to fill the box through the front (oil level filler plug) and the back (through the shifter), the oil will level out through the centre bearings which can take some time"

Sounds like a drift only requirement.



#52 Gareth. J.

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Posted 30 July 2013 - 05:05 PM

I have a syncro question so may as well post it here too. I have new Kameari CR set and all new syncros. Do I need to lap in all syncros or only syncro on the used 4th and 5th gears?

#53 d3c0y

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Posted 30 July 2013 - 05:10 PM

I can't answer your question sorry but did you get a gear set for the RB20 box or did you go a different route?

#54 Gareth. J.

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Posted 30 July 2013 - 05:19 PM

Yeah it's a set for the rb20(r32gtst) box Stu Wilkins had a .83 fifth that I also got.

Why are the new gears brown/bronze?

#55 NZeder

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Posted 30 July 2013 - 05:49 PM

The colour would be due to heat treatment process at a guess.

#56 d3c0y

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Posted 30 July 2013 - 06:25 PM

Yeah i was just going to say the same thing, or a coating.


PMC just made me a similar setup Kameari 71C gear cluster but in 71B housings so it just bolts up.

#57 Gareth. J.

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Posted 30 July 2013 - 07:18 PM

Here's what it looks like. I thought maybe it was to stop corrosion, but heat treatment sounds more likely.

Re syncros, I think I'll only have to lap the used gears as these will be the only ones that are worn/shiny.

EDIT. How did he fit the C gear sets into a B housing?

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#58 Blue Z

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Posted 31 October 2013 - 09:42 PM

Hi Gareth,

Can you explain how the bell housing is modified on r32 gtst gearbox to suit the l28?



#59 dat2kman

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Posted 31 October 2013 - 11:54 PM

Hi Gareth,

Can you explain how the bell housing is modified on r32 gtst gearbox to suit the l28?

Unbolt r32 bellhousing,
Place in rubbish bin,
Replace with a L series bellhousing.
It needs a bit of drilling and machining to the holes in the middle.

#60 Gareth. J.

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Posted 01 November 2013 - 06:30 AM

IIRC I plunge 1mm deep and 3.5" dia around the front lower bearing(on the inside of L series bell housing) it was also machined out to 63mm to accommodate the larger bearing. Top selector rod was machined out to 16mm.

Dat2kman was a wealth of knowledge on the mod and was constantly hounded with my questions. LOL. There's plenty of very knowledgeable people on this site who can help with pretty much anything.




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