Noise when shifting into 5th gear

steve216

Sometimes when shifting into 5th gear I get some lite resistance, and right before it locks into place it would make some kind of grind noise and instantly goes away. The car drives normal in 5th gear otherwise. I try shifting it slowly and it still sometimes does it, and other times it just works as normal.

MAMotorsports

What fluid are you running? Did it just start happening now that it is cooling off outside?

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steve216

Fluid is still from stock, 46k miles so far. This is a recent issue, don't know if the cooler weather maybe a factor.

Spooler

Have you ever changed the fluid? It should have been done at 30,000 miles. It is too late now though. Take it in for warranty to replace it.

Sean1125R

So did a search on the forum about noise when shifting to 5th gear and this was close but not quite what I'm experiencing. When I shift into 5th I hear a slight chirp noise that sounds like it is inside the car. No grinding noise and the shifts are smooth. It doesn't happen all the time and I can never seem to replicate the noise right after it happens. The Z is brand new with less than 2,000 miles on it. Any thoughts?

SurfDog

With a new gearbox it is probably not your synchros yet. (That comes later). I'd run the tranny for 5000 break in miles then put in some quality gearbox oil like redline.

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09 6spd Berk CBE, JWT cams, ZSpeed CSC, Stillen (25 row oil, brake cooling, sways, gen3 CAI), Passport (9500ci), Quaife LSD, Z1 400 hp kit, ss lines, pads, rotors, clutch etc, Phunk's pan and fuel starve fix

DOOMMONKEY777

common synchronous grind in 5th, if its frequent take it to the dealer, call it a lemon.

if warranty is up, put Redline oil brand in it, check manual for the correct weight and if it still is happening take it apart change synchronous, or by NEW transmission. about 2K

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JARblue

Sounds like your 5th gear synchro is going. If you're still under warranty, you can maybe get a new transmission out of it. If you're out of warranty, try to minimize wear on that synchro. Be patient with your 5th gear shift and try not to grind it

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steve216

so I guess this would fall under the powertrain coverage 60month/60k miles?

jwick

Yes. Same thing happened to me and Infiniti replaced the tranny under warranty.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

JARblue

Yes

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MAMotorsports

Exactly what all of them said. Stock fluid is not helping but the syncro's go bad on these.


If you are not under warranty, shoot me a PM and I can get you some Redline fluid pretty quickly.

__________________
Daelen @ MA Motorsports

MA-Motorsports.com

https://www.facebook.com/pages/MA-Mo...C/125379858828

jwick

MT85 is what I've been running for the last couple tranny changes and no issues. Good stuff

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

JARblue

Been running MT-85 for the last 55K miles

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SurfDog

Mine did this too... free tranny installed by Nissan dealer with my 100k mile powertrain warrenty (well,okay I had a 50 dollar deductible...).

Funny thing is, I blew the synchro at a track day with a not so great high RPM UPSHIFT!! To this day, I really don't know how that happened. I've heared a lot of these 5th gear synchros go bad so not I run Redline to help keep my new tranny happy

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09 6spd Berk CBE, JWT cams, ZSpeed CSC, Stillen (25 row oil, brake cooling, sways, gen3 CAI), Passport (9500ci), Quaife LSD, Z1 400 hp kit, ss lines, pads, rotors, clutch etc, Phunk's pan and fuel starve fix