Sticky: 370Z Transmission Failures (6MT)

370Z_RACER

mine is SMOOTH AS BUTTER

DIGItonium

I got the new transmission installed yesterday. It feels very different than the others. Going to let it break in.

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Baer383

This the stuff I use in my Harley trans and it not nearly as clunkly,I will use this on my 6sp when I change it.

Red Line Oil Heavy Shockproof Gear Oil (58204) on eBay!

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2013 ZL1

754 rwhp 747 rwtq

370Z_RACER

if your transmission goes, you don't know how to drive

Huck

If you post stupidity, you don't know how to drive.

I grind from 1st to 2nd sometimes at higher rpm. At first I thought I wasn't clutching all the way so I made a conscious effort to go all the way to the floor. Still happens. Same thing, skip shifting is sketchy. I took it to the dealership a few months ago, they "couldn't recreate the problem". I'm taking it back again soon.


Sent from my iPizzle using magic and new-fangled science stuff

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DIGItonium

Huck, I've come to accept the fact that the high RPM 1-2 shift is a hit or miss. With the other gears I don't completely take my foot off the accelerator pedal, and I can achieve some fast high RPM shifts. As long as I can daily drive without the 5th gear hiccup, I'll be fine. Everything else is smooth now.

You're kidding, right? I'm a smooth and fast shifter. Explain to me how I know how to daily drive a twin turbo 370Z.

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Baer383

I've learned from past experience that the more power you have the harder driving a stick becomes,so I imagine that a twin turbo would be hard I'll let you know after I put my SC in.

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2013 ZL1

754 rwhp 747 rwtq

DIGItonium

Your opinion means nothing until you get back in the FI'd club.

Seriously, though, that's not always the case. With daily driving, the car is pretty much stock since it is hardly in boost. When I'm in boost, it's typically half throttle around 3-4k RPM. That's usually when I'm getting on the freeway or trying to catch up in traffic.

The 1st transmission endured more punishment. With the 2nd transmission, I only had it for 3 months and it did not endure much punishment due to extreme hot weather over the summer.

What's interesting is the gearbox for all 3 transmissions (including the original) feel quite a bit different. The newest one feels so might tighter, and there is slightly more resistance. It's not notchy, but I can definitely feel the gears or something. What I find different is a noticeably louder whine in 2nd that I didn't hear before with the other transmissions.

So far no issues getting in any of the gears. No notchiness.

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Baer383

Why the hell did you have to have 3 tranmission?

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2013 ZL1

754 rwhp 747 rwtq

Huck

I may have to accept that, but it just upsets me that in my civic, mustang, and miata I could power shift all day long with no problem, but in the most expensive car I've ever owned its pretty much impossible. How the he k are you supposed to get good times on the 1/4 mile if you have to baby the stick??



Sent from my iPizzle using magic and new-fangled science stuff

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Davey

Plenty of people are having issues with the GT500, Boss 302, Mustang GT, Camaro, Corvette, etc. power shifting it and/or just shifting it fast. I would say to some degree it's that these manufacturers have little experience with building a transmission that shifts reliably at 6,000+ RPM, and to some degree, it's cheap **** that seems to work OK for the test drive and/or the first 10,000 miles.

DIGItonium

The first one is stock. I'm on my 2nd.

I'm sure it is known the Z transmission does not like super fast shifts. I went through the same ordeal with the '03 350Z.

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luigi90210

I rarely grind from 1st to 2nd and that was because of human error(only happened twice)

I don't drive it to hard though and when I do, I don't have any problems unless I'm being stupid

IDZRVIT

You're joking, right? I think however, that plenty of people are having issues with how to drive a manual. Just read the posts. They're everywhere. See my vette? It has the original B-W ST-10, if you know what that is, and I shift hard all the time with it. 90000+ miles and it's never been apart. So don't come in here and say that the American auto makers don't know how to spec a tranny. My Z roadster with the 6 speed, I have no problems shifting in any gear at 7500 rpm. So, did I get the only car that has a good manual? I doubt that. A guy goes through three trannys and claims there are issues with the it? Not likely. It's abuse or lack of shifting skills.

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"America.... still builds rockets!"
Vette: 355 cid, 400 rwhp
'13 CTS-V Coupe: 6.2L LSA, 556HP

DIGItonium

Um. No? What's there to prove that I can't drive a manual? It's a daily driven vehicle. It's not rocket science for the past 10 years of driving a manual. How the heck can I screw up 5th? It's not even a gear to drive hard in.

The first transmission failed after the clutch disk fused to the flywheel. Part of that problem was due to a defect in the aftermarket clutch disk that made it difficult to get in and out of gear. After fixing the flywheel and getting a new disk, 3rd gear (last gear it was stuck on) started to grind whenever RPMs exceeded 3k. The grinding got progressively worse, so I ended up getting a new transmission.

I did a few tests, and the car drove great. Then I dealt with record heat all summer, so I didn't get to drive the car as hard. Even if I wanted to drive it hard it's as easy as flooring it while in gear. What's so hard about that? After a month I notice difficulty getting into 5th. It took more effort than usual to get it in gear. All the other gears were buttery smooth. So I ignored it for 2 more months as it progressively got worse. Replacing the fluids with Redline didn't help either. My tech took it for a test drive and had issues getting into 5th as he was exiting the freeway and suggested the replacement.

So the one I have now is about 2 weeks old, and it's doing very well.

This thread is to share experiences with failed transmissions, not about who can or can't drive a manual. If some of you don't have anything valuable to contribute, then

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