SonicVQ

All,
Attached is a recording I made yesterday in my G37.
I whines is all gears, except 5th. (which is the 1:1 ratio and the counter shaft does not have any engine torque going through it)

Background:
-I have only owned the car for a few days, so history of noise is not known
-Doesn't change when cold or warmed up, it is always present when in gear and accelerating.
-I think the noise is much less when de-accelerating, but will double-check tomorrow.
-Noise is gone/almost gone in 5th and there is a little in 6th.
-Very noticeable in the first 4 gears

Please have a listen and let me know if this gear noise normal.

Thanks!

JSolo

iTrader: (14)

Does it whine only when in motion or when standing still too?

SonicVQ

Just when accelerating lightly or full throttle.

JSolo

iTrader: (14)

Ok. Different issue than what I was thinking. I'd say bring it in and let them figure it. Car is under warranty right..

SonicVQ

Yes it is

I talked to an Infiniti Service Advisor who talked to a tech and he said some gear noise in 1-3 is normal.

I picked up 3 bottles of Nissan's 75w85 and will drain/fill it tomorrow.
(Where is the warm weather when you need it, tomorrow's high is 34 degrees.)

SonicVQ

Jsolo: Do you hear any gear noise/whine on your MT6?

chuckie311

iTrader: (3)

could be your transmission mount going out. does it getting louder in the higher RPMS

JSolo

iTrader: (14)

Not like that. I have no whine period in any gears.

Now, for the first 3 years of ownership I had a nasty whine that varied with respect to engine rpm. Drove me nuts. Sounded like a supercharger whine. Eventually I found out about a tsb relating to an updated power steering reservoir. Got mine replaced, no more whine.

I should also mention, I too was fed the line that this whine (above) is normal. We even test drove a few cars on the lot that exhibited the same noise.

I don't normally drive at higher rpm, but do rev it up as high as 6K/6500 sometimes. Since the above repair, I can't say I've hear any whine.

You should update your OP with details about the car including year, mileage, and more details. Is this a new noise, has this noise always been present, does ambient temperature play a role, does it happen when the car is warm/cold, etc...

SonicVQ

Good point will update first post with:
-I have only owned the car for a few days, so other history is not known
-Doesn't change when cold or warmed up, it is always present
-Noise is gone/almost gone in 5th, a little in 6th
-Very noticeable in the first 4 gears

SonicVQ

It doses't get louder, but the frequency increases as engine RPM increases.

SonicVQ

I had the car up on jack stands putting on the snow tires/rims.
Since it is a new car to me, I wanted to have a good look at everything under the car.

There is a "lower shifter boot" that is designed to keep noise from entering the cabin by the shifter. It is was not properly seated and has about 1/2" gap on the left side.

The gap is there because someone CUT the rubber boot in half.
There is some additional insulation and I think this was added to reduce the tranny noise.

The part will be ordered tomorrow and I suspect the issue is resolved.

SonicVQ

It took a while to get the parts as they needed to come from Japan, but I am happy to report the gear whine is gone.

Here is the issue.
Someone cut the lower and upper shifter boots:






And with new boots installed:



Also, with the new boots in, the road noise is 90% less and the car so much quieter to drive. This was a nice and unexpected side benefit.

yellowzebra

That looks awesome, Could you please share the parts number?

SonicVQ

I did this 7 years ago and have no idea of the part numbers.

ILM-NC G37S

iTrader: (3)

74965-JK00A Cover, Transmission Hole
74960-JK000 Boot, Rubber Control Lever
74967-JK000 Insulator Trans Hole Cover
See this post