Nissan 370Z Forum
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Nissan 370Z Forum (http://www.the370z.com/)
-   Engine & Drivetrain (http://www.the370z.com/engine-drivetrain/)
-   -   Sticky: 370Z Transmission Failures (6MT) (http://www.the370z.com/engine-drivetrain/59494-sticky-370z-transmission-failures-6mt.html)

Whjaxn17 01-04-2019 12:50 PM
Quote:
Originally Posted by Rusty (Post 3812163)
You would be better off with a new tranny. There was one guy rebuilding them with better parts. But haven't heard anything about him for about a year now. So I don't know if if he is still doing them or not. He was a bit pricey too.
Level 10?

Rusty 01-04-2019 01:21 PM
Quote:
Originally Posted by Whjaxn17 (Post 3812169)
Level 10?
Don't they just do auto's? Never heard of them doing manuals.

Whjaxn17 01-04-2019 01:38 PM
Quote:
Originally Posted by Rusty (Post 3812177)
Don't they just do auto's? Never heard of them doing manuals.
I have no idea. I just had seen the name floating around and was asking if that was the shop you meant that you hadn't seen/heard about in a while.

Rusty 01-04-2019 01:56 PM
Quote:
Originally Posted by Whjaxn17 (Post 3812185)
I have no idea. I just had seen the name floating around and was asking if that was the shop you meant that you hadn't seen/heard about in a while.
It was a member on here that was doing them.

vman12 01-05-2019 12:18 PM
Quote:
Originally Posted by Spartan 1771 (Post 3812146)
I know this is an old thread, but I figured I would give it a shot.
I'm the original owner of my 2009 Z, which has a manual transmission. The car only has 24,000 miles on it. It doesn't have the sports package, so no synchro-rev trans and I’ve been using Red Line fluid for the past 14,000 miles. I believe the 6th gear synchro is shot. When powering through the gears under WOT it will grind going from 5th to 6th. If I power from 1st through 5th but then press the clutch, wait a second and then put it in to 6th, it won't grind. So like I said, sounds like the synchro to me. Correct me if I’m wrong. It’s been doing this for about 18 months, but the car is my weekend / summer car, so I haven’t been too concerned with it. In the mean time I have been squirreling away transmission parts for the inevitable repair. I’ve accumulated just about everything I want:

Z1 Parts:
Clutch, unsprung hub, lightweight flywheel, CSC elimination kit, steel braided clutch line and transmission mount.

I also have a set of Mtec shifter springs and an RJM clutch pedal. The only thing left to get is the RJM clutch master cylinder and the synchros. The car already has a B&M short throw shifter installed.

I spoke with someone at MA Motorsports earlier today about this repair and the installation of the mods. According to them: “Most of the time we suggest just replacing the entire transmission to be honest. The work to repair the gearbox is very time consuming and you still have a mostly used gearbox at the end of the day. For only a little bit more we can sell you a whole new transmission from Nissan (in most cases).”

Although MA Motorsports came highly recommended, has great ratings and appears to be trustworthy, I still have to question this, especially since the car has so few miles on it. I’m not one to cheap out on my car, so if this is necessary, I will go through with it, but I don’t want to waste money. Unfortunately for me, the car is WAY out of the warranty period, so the bill is on me.

Although I have done all of the work on my Z thus far, transmission work is WAY out of my comfort zone, so that’s not an option for me.

Thoughts, suggestions, ideas?
I have a 2014 370z manual with 30k miles. I had my transmission replaced this summer. I had the car for about 3 months and one morning i started noticing that it's getting really hard shifting into 6th gear (no noise just hard to go in). I made an appointment with the dealer. That afternoon driving to the dealer on the freeway i couldn't get the car into 6th at all. It was like hitting a wall, no matter how i tried to push it in. Tried going from 5th to 6th, from 4th to 6th, just wouldn't go in. Dropped it off at the dealer. Dealer test drove on the streets, came back said it was fine. I went with the technician and wanted him to show me how it was fine. In the parking lot we just sat with car off and changed gears. All 5 gears went in easy, you could almost use your pinky finger to push the the stick into gear. But 6th wouldn't go in. So he just grabbed it and with all power shoved it in. I told him no way that's how it's supposed to work (this is a japanese car not an old muscle car). It was fine before. Long story short i convinced him to get it replaced under powertrain warranty. They put a new one in, although i gotta say it still feels just a little tough at times going in to 6th (wonder if they put in a refurbished tranny, not a new one). Hey, but at least it works now.

Spartan 1771 01-05-2019 12:47 PM
Having to pay out of pocket for this is bad enough, but not knowing if it will happen again with the replacement is even worse. Are there any aftermarket transfer case parts that will solve these issues for the long term? I dont want to be back in the same situation in a year or two.

Rusty 01-05-2019 07:36 PM
Here's a thread you guys should read. :tup:

http://www.the370z.com/engine-drivet...nsmission.html

Spartan 1771 01-05-2019 09:27 PM
Quote:
Originally Posted by Rusty (Post 3812572)
Here's a thread you guys should read. :tup:



http://www.the370z.com/engine-drivet...nsmission.html
Thanks Rusty!

Spartan 1771 01-10-2019 06:27 PM
I got a quote from MA Motorsports and I honestly can't believe what I'm looking at.
The quote is for the following:
1. New Z34 transmission
2. Install the following customer supplied parts: clutch, flywheel, csc elim kit, trans mount, clutch pedal and clutch master cylinder.

Total with tax: $3,412.78

Does this seem right? I was really expecting something in the range of $6,000 to $10,000

I got the quote via email and plan to call them tomorrow to talk more about it.

Rusty 01-10-2019 06:45 PM
Quote:
Originally Posted by Spartan 1771 (Post 3814379)
I got a quote from MA Motorsports and I honestly can't believe what I'm looking at.
The quote is for the following:
1. New Z34 transmission
2. Install the following customer supplied parts: clutch, flywheel, csc elim kit, trans mount, clutch pedal and clutch master cylinder.

Total with tax: $3,412.78

Does this seem right? I was really expecting something in the range of $6,000 to $10,000

I got the quote via email and plan to call them tomorrow to talk more about it.
How much is the new tranny?

Spartan 1771 01-10-2019 06:47 PM
Quote:
Originally Posted by rusty (Post 3814382)
how much is the new tranny?
$2,103.57

Spooler 01-10-2019 07:30 PM
Quote:
Originally Posted by Spartan 1771 (Post 3814379)
I got a quote from MA Motorsports and I honestly can't believe what I'm looking at.
The quote is for the following:
1. New Z34 transmission
2. Install the following customer supplied parts: clutch, flywheel, csc elim kit, trans mount, clutch pedal and clutch master cylinder.

Total with tax: $3,412.78

Does this seem right? I was really expecting something in the range of $6,000 to $10,000

I got the quote via email and plan to call them tomorrow to talk more about it.
This looks about right. The tranny price is good also. I am sure that is a new Nissan tranny. That is about what they run.

Rusty 01-10-2019 07:33 PM
They're charging you about $1,300 for labor to install the tranny and your parts. That's not a bad price. A lot of places won't install your parts.

Spartan 1771 01-10-2019 07:47 PM
I'm thrilled with the price. Like I said, I was expecting a lot more. Since this is a lot lower then expected I'm going to speak to them about possible upgrades for the synchros. I dont want to go through this again in a few years.

Spooler 01-10-2019 08:02 PM
Quote:
Originally Posted by Spartan 1771 (Post 3814401)
I'm thrilled with the price. Like I said, I was expecting a lot more. Since this is a lot lower then expected I'm going to speak to them about possible upgrades for the synchros. I dont want to go through this again in a few years.
Don't miss/grind a gear and change the fluid every 30k at the most. That's your upgrade.

Spartan 1771 01-10-2019 08:13 PM
I've been driving a manual for 30 years and I'm a fanatic with maintenance on my Z. Beyond that, my Z only has 22,000 original miles on it. I've never had any transmission problems with any of my previous cars, some of which I beat the living crap out of. This issue has nothing to do with my driving or maintenance habits.

physics 03-08-2019 08:27 AM
Notchy and Noisy 1st to 2nd Gear Shift
 
My 2019 6MT sport with 3700 miles on it that has had a notchy 1st to 2nd shift since it was new, with the 2nd to 3rd shift a little notchy at times. I thought that it would smooth out as the transmission broke in but it has actually gotten worse. I'm now babying the tranny and double-clutching the 1-2 and 2-3 shifts to reduce further damage. My suspicion has always been that the synchros weren't working properly, but I'm no transmission expert. I have driven manual transmission cars ranging from mid-60s British sports cars, to a Porsche and numerous domestic cars over the last 45 years without a problem. I even had a couple of 5-speed Fords that had over 200,00 miles on them in which I had no problems with the transmissions, so I don't know.

I guess the first step will be to take it to the dealer to have them evaluate it. Knowing how these businesses operate, I'm anticipating having to fight with them to get them to acknowledge there is a real problem. Has anybody here had to go through the legal process to get Nissan or its dealers to do the right thing in cases like this?

Chuck33079 03-08-2019 08:40 AM
Quote:
Originally Posted by physics (Post 3832155)
My 2019 6MT sport with 3700 miles on it that has had a notchy 1st to 2nd shift since it was new, with the 2nd to 3rd shift a little notchy at times. I thought that it would smooth out as the transmission broke in but it has actually gotten worse. I'm now babying the tranny and double-clutching the 1-2 and 2-3 shifts to reduce further damage. My suspicion has always been that the synchros weren't working properly, but I'm no transmission expert. I have driven manual transmission cars ranging from mid-60s British sports cars, to a Porsche and numerous domestic cars over the last 45 years without a problem. I even had a couple of 5-speed Fords that had over 200,00 miles on them in which I had no problems with the transmissions, so I don't know.

I guess the first step will be to take it to the dealer to have them evaluate it. Knowing how these businesses operate, I'm anticipating having to fight with them to get them to acknowledge there is a real problem. Has anybody here had to go through the legal process to get Nissan or its dealers to do the right thing in cases like this?
Before you go that far, just go test drive another manual Z. These are clunky gearboxes. They're strong as hell, but the shifting is clunky. Better fluid helps, but it'll still make noise and have a rougher 1-2 shift than you might expect.

Cyber370 03-08-2019 09:08 AM
Sticky: 370Z Transmission Failures (6MT)
 
Quote:
Originally Posted by physics (Post 3832155)
My 2019 6MT sport with 3700 miles on it that has had a notchy 1st to 2nd shift since it was new, with the 2nd to 3rd shift a little notchy at times. I thought that it would smooth out as the transmission broke in but it has actually gotten worse. I'm now babying the tranny and double-clutching the 1-2 and 2-3 shifts to reduce further damage. My suspicion has always been that the synchros weren't working properly, but I'm no transmission expert. I have driven manual transmission cars ranging from mid-60s British sports cars, to a Porsche and numerous domestic cars over the last 45 years without a problem. I even had a couple of 5-speed Fords that had over 200,00 miles on them in which I had no problems with the transmissions, so I don't know.



I guess the first step will be to take it to the dealer to have them evaluate it. Knowing how these businesses operate, I'm anticipating having to fight with them to get them to acknowledge there is a real problem. Has anybody here had to go through the legal process to get Nissan or its dealers to do the right thing in cases like this?


You need to keep in mind that these trannies were designed for fast shifting at high rpms. You will get very notchy shifting especially 1-2 shifts when going slow and shifting at low rpms. In those instances, you need to slow down your shifting along with your speed.

My tranny in my ‘16 Nismo has been like this from new. I’ll bet that if they change out your tranny, the replacement won’t be much better.


Sent from my iPhone using Tapatalk

Quicksilvers 03-08-2019 09:10 AM
Quote:
Originally Posted by physics (Post 3832155)
My 2019 6MT sport with 3700 miles on it that has had a notchy 1st to 2nd shift since it was new, with the 2nd to 3rd shift a little notchy at times. I thought that it would smooth out as the transmission broke in but it has actually gotten worse. I'm now babying the tranny and double-clutching the 1-2 and 2-3 shifts to reduce further damage. My suspicion has always been that the synchros weren't working properly, but I'm no transmission expert. I have driven manual transmission cars ranging from mid-60s British sports cars, to a Porsche and numerous domestic cars over the last 45 years without a problem. I even had a couple of 5-speed Fords that had over 200,00 miles on them in which I had no problems with the transmissions, so I don't know.

I guess the first step will be to take it to the dealer to have them evaluate it. Knowing how these businesses operate, I'm anticipating having to fight with them to get them to acknowledge there is a real problem. Has anybody here had to go through the legal process to get Nissan or its dealers to do the right thing in cases like this?
Unfortunately the 6MT transmissions are well known for being notchy at times to shift. When you shift is your transmission is it making any noise that you know of? The 6MT transmissions in our Z’s are very strong and reliable I have seen them last 200K-300K miles really depends. Before you take any further action you should change your transmission fluid with a better quality fluid like Redline MT-85 transmission fluid and see if it smooths the transmission shifting out and makes conditions better. Changing your transmission fluid can make a difference.

Spooler 03-08-2019 10:03 AM
Quote:
Originally Posted by Quicksilvers (Post 3832187)
Before you take any further action you should change your transmission fluid with a better quality fluid like Redline MT-85 transmission fluid and see if it smooths the transmission shifting out and makes conditions better.
That fluid is too thick and will cause horrible shifting when cold. Use a GL-4 75w90 fluid of your choice. I use Amsoil MT fluid.

UNISYN 03-08-2019 10:28 AM
Quote:
Originally Posted by Fountainhead (Post 3807085)
Hey Unisyn
I'm in your area, Lake Mary, who (if you don't mind me asking) did your CSC work?
Mine is fine but I'd like to know my options.

Thanks!
Hey there, Fountainhead. I actually had it done at the Formula Tire & Auto (Firestone) on 434 near Wekiva Springs Lane back in 2015 when I was new to the area and it was only 3/4 mile from where I live. They did a good job, but it's pricey, meaning around $700. This last August I had the entire engine swapped with all new gaskets, water pump, spark plugs etc. and a Z1 Street Performance clutch put in at Z-Tech on 17-92 in Longwood ($5300! ouch). I would probably go to Z-Tech since he has been working on Z' since the early '80s, but they cost a little more due to quality of work. I'm happy with everything so far, but a couple of times it felt like the CSC was going out again, but it cleared up. I also had the transmission and rear differential replaced at the Nissan dealer a couple years ago right before the extended warranty ran out. That would of been a $6K job!

physics 03-09-2019 01:15 AM
Quote:
Originally Posted by Quicksilvers (Post 3832187)
Unfortunately the 6MT transmissions are well known for being notchy at times to shift. When you shift is your transmission is it making any noise that you know of? The 6MT transmissions in our Z’s are very strong and reliable I have seen them last 200K-300K miles really depends. Before you take any further action you should change your transmission fluid with a better quality fluid like Redline MT-85 transmission fluid and see if it smooths the transmission shifting out and makes conditions better. Changing your transmission fluid can make a difference.
Thanks for the good advice. I have used Redline motor oils and gearbox lubricants in the past in my Porsche and have always been very satisfied with their performance. I am planning to have the tranny oil and diff oil changed out with Redline stuff when I bring my car in for its 5K service and so I'll see if it improves things. Meanwhile, I'll continue to try to refine my 1 - 2 upshift technique to get smoother shifts consistently. Strangely, my downshifts into any gear, with SRM off, are all very smooth with no problem.

Quicksilvers 03-09-2019 01:31 AM
Quote:
Originally Posted by physics (Post 3832359)
Thanks for the good advice. I have used Redline motor oils and gearbox lubricants in the past in my Porsche and have always been very satisfied with their performance. I am planning to have the tranny oil and diff oil changed out with Redline stuff when I bring my car in for its 5K service and so I'll see if it improves things. Meanwhile, I'll continue to try to refine my 1 - 2 upshift technique to get smoother shifts consistently. Strangely, my downshifts into any gear, with SRM off, are all very smooth with no problem.
Welcome it sounds like nothing abnormal I would recommend keeping the SRM off then. My 6MT transmission was sometimes a bit notchy at times and strangely enough I would change my transmission fluid and it would overall smooth my shifts out. I highly recommend Redline MT-85 fluid for the transmission it worked very well for me. You do know for your differential Redline 75W90 gear oil is highly recommended and it has the required friction modifier already in it as well. Depending on your out come have you ever considered installing a different clutch/flywheel set up? The Coolerworx shifter would really help you out.

mike86 02-25-2021 10:19 AM
Reviving the discussion to share some serious issues with my transmission.

In FSM found only end play for input shaft - almost no play allowed (0-0.1mm or 0-0.004in), but nothing for the output where propeler shaft mounts into.
My output side of transmission where propeler shaft connects to has pretty huge play side to side, which shouldn't be there because of bearings, right? In/out play, there's little

Except of the failing syncros I haven't read here about failing bearings on transmission shafts therefore I'm pretty surprised.
Mine's 2010 and has only 49k miles (78k km).

I've posted my issue with strange bouncy behavior of the car with videos already here:
http://www.the370z.com/engine-drivet...ml#post3985775
to see if anybody has had such an experience.

With such a play it's time for new transmission.


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