Transmission failure
 

Well 6th is gone in my manual and the only thing i can think of is defective parts. Took it in showed the man in the uniform what was wrong and they are calling nissan to see what they want to do. Anybody have one replaced yet? Wondering if i'll be waiting a month for my car.

how many miles?

are you an aggressive driver?

Well I hope you were nice to it and didn't abuse it. I would demand a loaner for the length of time you had no vehicle. Also your insurance might cover a loaner vehicle, I would check your policy.

This whole 6th gear issue is becoming more prevalent. I'm hoping I don't have this issue later one

Is there a trend yet we can piece together as far as more freeway driving vs. street driving, agressive vs. not, mileage, build dates, etc???

i had 6th gear grinding i have a new transmission on the way from nissan the tech drove it around for like 10 minutes came back and had one on order for me, should be here this week minimum downtime. im not to worried about the car, its a first year model there will be some kinks to work out especially with it being the first SRM transmission

1. How in the F**K do you abuse 6th with out going like 170?
2.9,600 miles
3. Transmission is ordered should be done next week.
4. Left the dealership got it up to 55 and after one shift the tech had me turn around and head back. Nissan approved replacement about an hour later.

heh i have just over 4k miles my self hopefully our new transmissions will last us a lot longer!

1slow370- so it just grinds when you try to get into 6th?

is that how you started noticing the problem? wat where the early symptoms?

6st gear problems
 

Just curious...are all of you who have had the 6st gear problem driving the Sport Package with the syncro-match 6-speed? Or, does this problem also appear with the base 6-speed tranny?

No issues what so ever with my transmission.

A Transmission issue at 4 to 6 K points directly at driver attitude.

Good luck.

vifferman -i dont think the gearbox itself are different between
SRM and non-SRM.. just a matter of having sensors on the gates to
detect shifter location of the gate telling ECU how much to rev vs
speed of the car.

in fact, if the problem is with the syncro's then SRM should
lessen the chance for the problem as it rev matches during
up-shifts too.

so not sure wat it is. it could be just a defective material on
the gear's collar?? :confused:

Not necessarliy......While there are plenty of guys here who beat on their cars, there have been enough reports of this and similar issues with the 6th gear syncros to lead us to believe it is a relatively isolated manufacturing or bad part issue...

Attitude? reference earlier comment on how the F**K do you abuse 6th? hard downshift from reverse? Not my first stick and the first one I've ever had a problem with. When i said sixth gear is bad and showed the man he asked me if i track the car and i just said it's 6th his response "oh." It's already been approved by NISSAN.

Shifted hard into 6th every since i bought it like it took a little more effort than other gears until it dropped in. Start making the standard zipper sound, then progressed to Zipper + grind. If i double clutch and baby it(like 6 seconds to move in from 5) it shifts like the same old crap it was new but you could feel it was bouncing a bit. All in all totally unacceptable for a new car to have 6th gear or even 5th gear problems. The amount of torque those gears see doesn't amount to much that is why they are physically about half the size and beefyness of first gear(thinner and such). Also is why 1 and 2 get double cone syncro's and the rest are single. Chock this one up as one of the reasons to kick an engineer in the balls.

i'm shocked! '1slow370' sorry to hear, sux this happen on a new car! when was your built?


I dont have the 6sp but my 7sp runs perfect with zero problem!

sw- your 7sp has a torque converter. There's your problem. :D

1Slow370z- thanks for the info. Most cars I've had were pretty stubborn to get into 6th when new, so I can understand why you didn't address it earlier to the dealer.

Keep us posted what the problem was.


So far my Z has been very smooth to get into all the gates. Was actually surprised how smooth it got into 6th.

Were you using the SRM? I'm curious if the transmission failures are occuring in cars driven solely using SRM, driven without SRM and attempted to rev match manually, or without SRM and no attempts at rev matching on shifts.

SRM should have nothing at all to do with this. It actually has little to do with the transmission really, except for the microswitches at the shifter which send the signals to the computer to do the engine rev match. Syncro and gear failures are stictly mechanical issues..

Correct me if I am wrong but I thought there was a small magnet on top of the tranny that lines the syncros up to perform the blip.

More interested in driver miscalculation during engine rev matching during shifts as a possible cause to premature failure. My thought is that SRM would minimize the effect of poor rev matching which could contribute to premature transmission wear.

Syncros have to work just as hard downshifting with or without SRM rev matching since it's not a true double clutch match.....Doubt it would make a difference...

4500 miles and no issues to speak of. Then again, I don't use 6th all that often. Usually only when the MPH heads north of 80 on the highway. I treat it more like a cruise control gear if that makes any sense... In other words, no stop and go traffic, long highway runs, etc.

I agree with you, SRM is designed to smooth out gear changes and balances the chassis. In fact it might actually avoid damages to your transmission while downshifting! It’s a great feature but heel and toe is still more fun but not as accurate as the computer!

I already got mine replaced once... it was the synchros.. they replaced the whole trans

Did they explain to you how the synchro contributed to the failure??

Nope just took it and replaced it.. the tech pulled the trans off and put the new one on in like 4-5 hours lol.. i was impressed.

Here's a better solution: forget 7AT or 6M, just cut a big hole in your floor board and scream "yabba, dabba doooooo!!!!!!!!!!!" and you'll shift faster than any tranny for that matter :)

now that makes no sense cause fred's feet are the engine.
we're talking about transmissions here...

Like any car, there are bound to be some problems, but there have been a number of posts on this board of new buyers of MT who have never driven one and asking advice whether they can do it. There was also a thread where it was stated that someone discovered that they didn't need to fully depress the clutch to shift. And we know a few are drivin the sh.. out their cars and a missed shift etc is possible. So lets not blow this out of proportion until there are more reports or we understand more of potential causes.

Looks like it's just a rotational (RPM) speed sensor Lou...Check the pic at the link....:
2009 Nissan 370Z's SynchroRev Match Explained - Tech Dept. - Auto Reviews - Car and Driver

Ever hear of the snap ring issue with the NSX transmission? It could be something as simple as a tolerance stacking issue. I suspect NISSAN will be working on this.

Nike or Adidas - those will get you places. Reebok's are overrated yo for speed.

not my first manual, not my first z, but it was the first time i've ever heard those noise coming from MY car and it's new so fail. For referance my plymouth neon shifts better than this car. Even with a new transmision oh and there's over 150,000 on that neon's original gearbox. Is a quaife sequential streetable and does it have synchro's or just dog engagement?

Shifting into 6th seems more firm than the other gears for sure. I attest this to the fact that it's underused in comparison, but from the looks of things here I'll start keeping an eye on it.

It's never scratched or grinded, but there have been times where I go to "throw" it into 6th like I'm used to doing on other cars, and I just bounce into neutral. Seems to me that this gearbox has a "bump" to go through to get into each of the gears and 6th is just a little larger/less worn bump.

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