5th gear scratch (not a grind)

NismoNY · 08-06-2015, 10:58 AM

Taking the car to the dealer this weekend just to confirm the issue. If it's nothing or normal then that's fine with me. At least the car is CPO till 2021

mishuko · 08-06-2015, 11:03 AM

Quote:

Originally Posted by Jsolo

The upper gears should be easier because the rpm differences between are smaller. I recall reading that the lower gears have multiple syncro's vs the upper which only have one. This sheds light on why the upper gears can be a bit notchy.

The 1-3 is more a function of timing the clutch/rpm differences just right. Even when timed just right, 5-6 is just not as smooth as say 1-2 or 2-3.

The cold temp issue is the trans fluid. As I mentioned MT85 worked great initially then went to crap. The nissan fluid is not as smooth as MT85 but works year round (or so we shall see this winter). Pick your poison

uhh our first is super short and going from 1-2 i'd be pausing to let the rev's drop enough to smooth the transition.

i did swap my trans/differential fluids 1000km ago and noticed the shifts being smoother again. marginally at best. can't tell the differential, guess i'm not driving around corners fast enough

if you're having trouble with your upper gears i'd def get your synchro's checked. i have no problems 3-4, 4-5, 5-6 and going rowing back down. always have difficulty engaging 1st from a rolling stop when cold and 3-2 shift when very cold. i generally don't rev about 3k until i see the coolant temp move up to operating temps.

MagmaRed370z · 08-06-2015, 11:09 AM

Quote:

Originally Posted by NismoNY

I'm interested in your reply. This might be the same thing I'm experiencing. Can you more clearly describe this occurrence? Does it happen all the time? Again, this feels like the shifter is scratching something or skimming something as it goes into 5th from 4th. It's not really audible the way a grind is but can be felt

Jsolo...the notchiness is normal. My 350z was nothing and so is this. Sometimes it feels like you're going thru a knot in the shift, right? Yep that's the notchiness and its normal

It does not happen all the time. Maybe 5% of the time. Going from 4th to 5th I can feel a little bit of a metallic sound similar to a very small grind.

NismoNY · 08-07-2015, 08:57 AM

Quote:

Originally Posted by schellingr

It does not happen all the time. Maybe 5% of the time. Going from 4th to 5th I can feel a little bit of a metallic sound similar to a very small grind.

Perhaps this is what we are feeling. Taking it to the dealer tomorrow but with my luck, they won't be able to replicate it since it happens rarely.

jwick · 08-07-2015, 10:22 AM

I had the syncro (grind) issue in both 5th and 6th. Most of the time it would happen when I would change gears involving a large rpm range change (i.e. 3rd-to-5th or 4th-to-6th). Took it to the dealer and they replaced the tranny under warranty. Haven't had an issue with the new tranny but it only has 5-6k miles on it (although at least 5k of those miles are boosted miles with around 550ft-lbs at the crank).

Just make sure you explain the exact conditions it happens. I had to talk directly to the tech and tell him when I experience it. He drove it around the block and immediately came back and said they were replacing the tranny.

Cory Gillmore · 11-18-2018, 11:11 PM

Mine does this in 5th every single time when cold. Going from 4-5 or down from 6-5. Then when the car warms up a bit it stops completely.

jmroy6 · 11-19-2018, 01:07 PM

Quote:

Originally Posted by Cory Gillmore

Mine does this in 5th every single time when cold. Going from 4-5 or down from 6-5. Then when the car warms up a bit it stops completely.

i have the same issue, so when its cold I always go to neutral before switching to the next gear solves the problem for some reason.

elhombre · 11-19-2018, 03:58 PM

My car has done the same thing since about 23k (now have 65k)

I have worked around getting the transmission done by just letting the car warm up before I really start shifting hard from 4th to 5th.

It seems it only "scratches" when the oil temp is low and the fluid is more viscous in the transmission...

nis350 · 11-19-2018, 11:45 PM

Quote:

Originally Posted by elhombre

It seems it only "scratches" when the oil temp is low and the fluid is more viscous in the transmission...

Lvcky69 · 11-20-2018, 08:21 AM

I had this issue with only 10k on the car. only shifting to 3rd.. Changed the fluid and now it is gone. I am at 23k

JARblue · 11-20-2018, 09:07 AM

Nissan told me to go suck an egg when I asked for transmission replacement under warranty a few years back. Over 100K miles now and no change. It seems in my experience the scratch is most noticeable with a quicker shift (4-5) on a cold transmission at lower RPMs. I've also found that a slower shift or double clutch with proper rev match pretty much eliminates any noise regardless of the temps or speed.

jwick · 11-20-2018, 09:32 AM

Quote:

Originally Posted by JARblue

Nissan told me to go suck an egg when I asked for transmission replacement under warranty a few years back. Over 100K miles now and no change. It seems in my experience the scratch is most noticeable with a quicker shift (4-5) on a cold transmission at lower RPMs. I've also found that a slower shift or double clutch with proper rev match pretty much eliminates any noise regardless of the temps or speed.

Infiniti replaced mine and they couldn’t even duplicate it on a test drive. Service Manager said they had a write up from the manufacturer about it so he’d go ahead and replace it for me. It’s funny how much better service you get from a ‘luxury’ dealer.

JARblue · 11-20-2018, 10:40 AM

Quote:

Originally Posted by jwick

Infiniti replaced mine and they couldn’t even duplicate it on a test drive. Service Manager said they had a write up from the manufacturer about it so he’d go ahead and replace it for me. It’s funny how much better service you get from a ‘luxury’ dealer.

I took them on a test drive to demonstrate exactly what the problem was. What irritated me the most was the warranty wasn't even through Nissan. It was a 3rd party - so I'm like if you guys just approve the damn thing, someone else will pay you to install it. No dice

08-07-2015, 10:22 AM	#20 (permalink)
jwick A True Z Fanatic Join Date: Dec 2010 Location: Houston Posts: 14,532 Drives: '10 G37 6MT Rep Power: 2465057	I had the syncro (grind) issue in both 5th and 6th. Most of the time it would happen when I would change gears involving a large rpm range change (i.e. 3rd-to-5th or 4th-to-6th). Took it to the dealer and they replaced the tranny under warranty. Haven't had an issue with the new tranny but it only has 5-6k miles on it (although at least 5k of those miles are boosted miles with around 550ft-lbs at the crank). Just make sure you explain the exact conditions it happens. I had to talk directly to the tech and tell him when I experience it. He drove it around the block and immediately came back and said they were replacing the tranny. __________________ '10 G37T 6MT Graphite/Graphite - BP - G37T Build

11-18-2018, 11:11 PM	#21 (permalink)
Cory Gillmore Base Member Join Date: Nov 2017 Location: Memphis TN Posts: 113 Drives: 09 Sport/Touring MT Rep Power: 3363	Mine does this in 5th every single time when cold. Going from 4-5 or down from 6-5. Then when the car warms up a bit it stops completely. jmroy6 and elhombre like this.

11-20-2018, 09:07 AM	#26 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 44 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	Nissan told me to go suck an egg when I asked for transmission replacement under warranty a few years back. Over 100K miles now and no change. It seems in my experience the scratch is most noticeable with a quicker shift (4-5) on a cold transmission at lower RPMs. I've also found that a slower shift or double clutch with proper rev match pretty much eliminates any noise regardless of the temps or speed. elhombre likes this. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

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08-06-2015, 10:58 AM	#16 (permalink)
NismoNY Base Member Join Date: Feb 2015 Location: NYC Posts: 112 Drives: 2014 Nismo Rep Power: 11	Taking the car to the dealer this weekend just to confirm the issue. If it's nothing or normal then that's fine with me. At least the car is CPO till 2021

11-19-2018, 03:58 PM	#23 (permalink)
elhombre Base Member Join Date: Feb 2016 Location: CT Posts: 93 Drives: 2009 370z Rep Power: 146	My car has done the same thing since about 23k (now have 65k) I have worked around getting the transmission done by just letting the car warm up before I really start shifting hard from 4th to 5th. It seems it only "scratches" when the oil temp is low and the fluid is more viscous in the transmission...

11-20-2018, 08:21 AM	#25 (permalink)
Lvcky69 Enthusiast Member Join Date: Jun 2017 Location: Miami Posts: 385 Drives: 17 370z & 16 911 S Rep Power: 3922	I had this issue with only 10k on the car. only shifting to 3rd.. Changed the fluid and now it is gone. I am at 23k