350Z 6spd transmission for you KA or SR? Yes plz.

[homeslicej2]

I saw that thread for the adapter stuff on Zilvia, first time I've seen JWT news on it (even though it was months ago I see) Would be worth it if you are making the power. As for a taller rear gear, could you just swap in an S15 helical and not bother with switching the stock ring gear (3.54) out for the stock 240 one, making it a direct swap? I remember that people swap the ring gear bc with the 5-speed, the 3.54 is too tall, but does everything else match up otherwise? I can't remember. Razi, I thought driftworks quit making those knuckles?

[Razi]

They are making a 2nd version.
I think they made a few changes here and there, but also now I think you can use the Z32 drum brake setup with it.
I'm not 100% loving it because the bushings are still rubber.

The PBM ones will come with spherical bushings.

[OutToWinPAHC]

^^^I'm not gonna lie. Imma totally pull the ricer card and say I want one just cuz. And yes, I'd be willing to pay decent money to make it happen. From looking at the similar Zilvia thread, the cost doesn't seem like it would be that unreasonable.

The final drive for a z33 6 speed is suckage.

Clarify, plz.

Because I think stock KA transmissions final drive is greater suckage. The Z33 trans may not have the following that the T56, but more options is always a good thing, IMO.

I would like to see some weight comparisons between the 3 transmissions. Anybody got any figures?

The 350Z uses a 1:3.35 differential. Most of us 240 guys use a 4.089 or J30 3.9X, or a Q 3.689. So off the bat the RPM vs Speed just decreased making the gears shorter. The 3.794 first gear is nuts! I ran the numbers and your on the rev-limiter at 30MPH in first .And overall, those ratios are not tight at all. Granted the transmission is stronger, but they also come with issues. You can stock pile a few Z32 transmissions for less.

Now for final drive it should be double overdrive with 6th at .5x.

So yes you get short gears and more of the, with a lot more need for shift, and if your tracking it, well build it because the syncros are horrible. You can find these trans all day (girnds) for cheap for a reason

http://www.car-videos.net/tools/speedrp ... ecalculate

[simmode1]

How do you guys think this would effect a VH45 swapped 240? You know, as opposed to using the VG trans?

I think I'mma head over to the 350z board and ask them exactly how bad/widespread this synchro problem really is... After all, they helped ease alot of my concerns when I heard about the VQ35's oil consumption problems...

[motoman399]

I think this is a great idea. If I could source a trans cheap enough I would run it. I'm kinda scared that when I get my car going its going to leave me stranded.

[simmode1]

I asked the 350z guys about their transmissions:
post5945851.html#p5945851

Chime in if you guys got more questions...

[assassin7420]

Don't know if it was said or not, but for the people looking for a 6 speed just to have one.....You do know they have 6 speed SR transmissions. S15 = 6 speed. Just get a speedo healer and boom your done.

As for Z33 transmissions. From what I saw wile I worked at Infiniti, I wouldn't put one in my car. That and I hated how they felt, stock clutch or aftermarket.

Like I said, It's not for me but cool none-the less that we have more trans options.

[simmode1]

S15 trans is reputed to be even weaker than the 5spds...

[assassin7420]

That's why I said for the people who just want a 6th gear. Knock on wood but I don't see how people blow up stock SR trans so easily. I've put mine though hell and its still fine.

[Razi]

Probably high horsepower + clutch kicking, that's killing them.

[simmode1]

Probably high horsepower + clutch kicking, that's killing them.

That's pretty much what BusyBadger said.

My understanding (since I've not experienced it myself) is that the grind typically happens on the 2nd to 3rd shift in the '03 (and some'04 models). I've not heard any complaints about grinds from any models from 2005 and later.

I can't tell you "exactly what is happening", but I'll give you some educated guesses, First, is that there are buyers that got their Z and are driving it primarily in city traffic, constantly rowing through the lower gears and causing a lot of wear on those synchros on the lower end. Second, you get people buying the Z's that haven't driven an MT much, if at all, and they have bad footwork. They're not keeping the clutch all the way down when they shift or they're shifting before they've got it all the way down and are causing premature wear on the synchros. Last, there's the people that bought the car with no intention of driving it easy and are just ragging it out through launching and power shifting. My money is on the first and last being the most common causes of bad synchros.

I searched the topic on Google and some big name ppl in the Z33 community seem to agree.

The CD009 transmission price makes this swap alot less actractive, IMO. But the grinding trans issue only seems to effect 03 & 04 Z's. I searched Google for '350Z transmission grinds/problem' and didn't find one post on a car 05 or newer. 05 is when Nissan switched to the Revup motor. Seems like that year fixed both the transmission issues and the VQ35's oil comsumption problems...

[AZ89two4Tsx]

Don't know if it was said or not, but for the people looking for a 6 speed just to have one.....You do know they have 6 speed SR transmissions. S15 = 6 speed. Just get a speedo healer and boom your done.

Incorrect.

The S15 trans is longer.

[OutToWinPAHC]

Which one the S15 oem, or S15 Nismo?

[AZ89two4Tsx]

Ah, my mistake, they ARE the same length. They just crammed the 6th gear into it.

But there are some differences. Got this from the OTHER forum....

- The 6MT flywheel is much thicker than the 5MT. Consequentially, the bell housing is also deeper by the difference in thickness.
- The copper pilot bearing is located in the 6MT flywheel, rather than in the SR engine for the 5MT.
- The 6MT is divided into three sections, rather than two for 5MT. So, no! You cannot put a KA bell housing on a 6 speed.
- The shifter and shifter plate are not the same between the 6MT and 5MT.
- The output shaft to the driveshaft is not the same as the 5MT. The splines are just slightly thinner.
- Shift knob threading is wider, but have the same thread pitch. 6MT = M12x1.25. 5MT = M10x1.25.
- The Vehicle Speed Sensor (VSS) is located on the differential rather than the transmission.
- The 6MT cross-member is opposite of the 5MT. (The AT cross-member is closer to the 6MT, but still will not fit.)

Basically, it's not worth it to have that extra gear. You'll need a different driveshaft and crossmember.

[homeslicej2]

S15 trans is reputed to be even weaker than the 5spds...

...and yet Broadfield has run 400hp & 333 ft/lbs at the wheels for 4 years on his stock S15 trans. If you are drifting and/or doing high rpm clutch dumps, I'm sure the stock S15 trans will break soon. For street driving, even with high hp, it seems to last though.

[simmode1]

Well duh... Of course it'll be fine if you baby it. j/k

I check S15 6spd prices real quick... At those prices, you might as well save a little bit more for the cd009!