S15 6 Speed Transmission for Dummies

[TheRealSy90]

Wish I could find a damn s15 autech sr20de engine.


Sent from my iPhone using Tapatalk

[lowered_impressions]

Hey! What’s the exact fluid capacity on the 6mt? And can you pour it in from the shifter like the 5mt?

[dwnshft2drft]

Originally Posted by lowered_impressions

Hey! What’s the exact fluid capacity on the 6mt? And can you pour it in from the shifter like the 5mt?

6MT oil capacity is 1.8 liters (3-7/8 US PINT)

[TheRealSy90]

Should be the same capacity as the 5sp and yes.

[jr_ss]

Originally Posted by lowered_impressions

Hey! What’s the exact fluid capacity on the 6mt? And can you pour it in from the shifter like the 5mt?

Pull the side "fill" plug and add fluid until it starts to drip/pour from that hole.

Originally Posted by TheRealSy90

Should be the same capacity as the 5sp and yes.

I would imagine it's probably slightly less considering there is more gearing/shafts/bearings in the same space.

[Fastimport]

Although the speed sensor port wasn't bored into the tail shaft housing, when I pulled it apart, there was a nice surprise
A genuine 6-speed drive gear was already on the shaft !



Now, if I can just find the part number...

The housing was bored, and because this is going into a cable drive application, I picked up the driven assembly from the old Z-car 71B trans.

[TheRealSy90]

Woah, first 6sp I’ve ever seen with a speedo gear from factory.


Sent from my iPhone using Tapatalk

[Fastimport]

Another local Nissan guy thinks that it's aftermarket, and is digging for the info.
I'll let you know.

[99lspwr]

anyone know the part number to just the cross member? I have an s14 with this 6 speed and only 2 of the cross member bolts are currently being used...

[LoSt180]

Originally Posted by 99lspwr

anyone know the part number to just the cross member? I have an s14 with this 6 speed and only 2 of the cross member bolts are currently being used...

Looks like you can buy an installation kit that includes that cross member. Start there maybe? https://conceptzperformance.com/nism...et_p_24222.php

[99lspwr]

Originally Posted by LoSt180

Looks like you can buy an installation kit that includes that cross member. Start there maybe? https://conceptzperformance.com/nism...et_p_24222.php

thats the one i was coming across as well... Just did not need all that stuff in the kit since my car is allready together and running.. Thanks for the reply

[Fastimport]

I have 4 of the speedo gears coming from Japan (all that I could find).
And will be offering them as a kit, that will include boring the tail shaft housing, the gear, ball, and 2 snap rings.

Stay tuned

[dwnshft2drft]

Originally Posted by Fastimport

I have 4 of the speedo gears coming from Japan (all that I could find).
And will be offering them as a kit, that will include boring the tail shaft housing, the gear, ball, and 2 snap rings.

Stay tuned

Add me on your list for s14 speedo.

[TheRealSy90]

So what's the deal on the speedo gears? They're oem? And there's only 4 left in the world or they just don't have many in stock.

[dwnshft2drft]

Originally Posted by TheRealSy90

So what's the deal on the speedo gears? They're oem? And there's only 4 left in the world or they just don't have many in stock.

All I care is he’s doing us a favor. I don’t have time to sit and search.

[jdm_land]

Does anyone know if the S15 auto driveshaft will work with the 6 speed in a s13 with a skyline diff? Thank you

[slow_sr20]

Anyone running short shifters on their 6 speed? I’m looking for input. I never ran short shifter on my 5 speed SR but the six speed throw seems very long?

I’ve only ever seen one C’s That I slept on...
There’s an Australian company (Cube) on EBay that has a nice looking one, and anther on EBay that appears to be a copy of cube Australia.

I’m not super aggressive and I understand short shifters can be hard on synchros, still would like to see what others are doing.

[Bernie (NoVA)]

Originally Posted by slow_sr20

Anyone running short shifters on their.....

I have a genuine c's for 6 speed available. PM me

[TheRealSy90]

At this point it just seems so much easier to run an abs ring and dakota converter for the speedo.

[zenkizenki]

My 6 Speed is about to blow, can i use the 6 speed bell housing on a ka24de tranny? Keep the dual mass flywheel or go with smaller 5 speed one.
Thanks

[S14rebuild]

Originally Posted by zenkizenki

My 6 Speed is about to blow, can i use the 6 speed bell housing on a ka24de tranny? Keep the dual mass flywheel or go with smaller 5 speed one.
Thanks

Nooo does not work

[600hps14]

epic thread - nice to see good info like this out there

[My!]

hello everyone, i'm trying to rebuild my transmission and am hunting for these parts if anyone could point me in the right direction:
2nd gear 28tooth
4th gear 34tooth
1/2 synchronizer sleeve
3/4 synchronizer sleeve
5/6 synchronizer sleeve
Reverse synchronizer sleeve
Reverse gear 35tooth
Input shaft 28tooth,24 spline, 9-1/8” long
Bearing kit
Seal kit
Synchronizer ring kit

waiting on nengun and megazip to email me back but was hoping someone else could help me stateside.

[dwnshft2drft]

Need the part number.

Originally Posted by My!

2nd gear 28tooth
4th gear 34tooth
1/2 synchronizer sleeve
3/4 synchronizer sleeve
5/6 synchronizer sleeve
Reverse synchronizer sleeve
Reverse gear 35tooth
Input shaft 28tooth,24 spline, 9-1/8” long
Bearing kit
Seal kit
Synchronizer ring kit

[My!]

Originally Posted by dwnshft2drft

Need the part number.

yes i do, ive found diagrams online through nengun but i'm not confident enough to determine which is which without a description.

here's the two diagrams i've been looking at: https://www.nengun.com/oem/group/Mzg...VhciA8dW5pdD4=

[dwnshft2drft]

A quick search for now. If you can copy that nengun diagram and highlight which ones you need. That way I can give you exact part numbers and price.

Discon - 2nd gear 28tooth
$85.81 - 4th gear 34tooth
$38.27 - 1/2 synchronizer sleeve
Discon - 3/4 synchronizer sleeve
Discon - 5/reverse synchronizer sleeve
$33.91 - 6 synchronizer sleeve
$90.35 - Reverse gear 35tooth

??? - Input shaft 28tooth,24 spline, 9-1/8” long

Sold individual - Bearing kit

Sold individual - Seal kit

Sold individual - Synchronizer ring kit

[My!]

Originally Posted by dwnshft2drft

A quick search for now. If you can copy that nengun diagram and highlight which ones you need. That way I can give you exact part numbers and price.

Discon - 2nd gear 28tooth
$85.81 - 4th gear 34tooth
$38.27 - 1/2 synchronizer sleeve
Discon - 3/4 synchronizer sleeve
Discon - 5/reverse synchronizer sleeve
$33.91 - 6 synchronizer sleeve
$90.35 - Reverse gear 35tooth

??? - Input shaft 28tooth,24 spline, 9-1/8” long

Sold individual - Bearing kit

Sold individual - Seal kit

Sold individual - Synchronizer ring kit

u sir are a badass, and i will pm u

[mrrisk]

Great write up! This is premium quality stuff.

[racinjayson]

Ok, so I had my reverse shifting fork break on my 6spd and I was having a hard time trying to find parts for this transmission. Turns out the 99 to 05 Mazda Miata 6spd trans is made by the same company(Aisin AZ6), so I took a chance and purchased one that was a core for parts only. Here is the low down, the input shaft for the two are different and the main shaft as well as the bell housing and tail-shaft housing. The gears are different ratio's but the same as in they'll work in the nissan trans. All the syncro's, shift forks, bearings, secondary main shaft and complete center section including the case itself are exactly the same. So if you looking for parts to rebuild your nissan trans in the U.S., you can get most everything you need out of the mazda and you can get parts online from Jim Ellis Mazda with a complete parts diagram breakdown. Hope this is of some help to anyone in need of some rebuild parts, thanks.

[TheRealSy90]

Originally Posted by racinjayson

Turns out the 99 to 05 Mazda Miata 6spd trans is made by the same company(Aisin AZ6)

The Aisin AZ6 is in a ton of vehicles:

Altezza AS200 & RS200
Lexus IS300
Toyota "86"
Scion FRS
Subaru BRZ
Mazda MX-5
Mazda RX-8
Nissan S15

Has anyone tried the "circlip fix" on their s15 trans? There's a company in Australia that does the fix or can send the parts pre-done. Apparently it's the main weak point that causes the strength issues on these trans and once the revised part is installed they hold up to a lot more power/torque.