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#4487986 - 08/14/17 12:06 AM first gear whine- manual trans
plat Offline


Registered: 08/12/17
Posts: 2
Loc: Los Angeles
What do you guys think about this whine?

This is your average 5 speed, front-wheel drive tranny in a car.


The noise:

* 1st gear only
* higher pitch than reverse and quieter
* only present under load in 1st, silent when coasting in gear and on overrun(engine braking)



A lot of folks would say the bearings closest to 1st gear. But wouldn't that make noise under load in both directions? As in accelerating and overrun?

I think wear on the tooth face, but not the back of the teeth, for the 1st gearset makes sense. That would explain the noise only when loaded in one direction. What do you think? And how could this condition develop in an otherwise healthy trans?

I have already changed out the fluid and filled with MT90, which made no difference. The old fluid was clear and showed no metal debris. The car is at 102k miles and has been well maintained.

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#4488076 - 08/14/17 06:46 AM Re: first gear whine- manual trans [Re: plat]
Eddie Offline


Registered: 12/07/03
Posts: 9574
Loc: Florida, Cape Coral
Often times the first gear is not helical cut so it is by nature nosier than the other gears. Ed
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#4488088 - 08/14/17 07:00 AM Re: first gear whine- manual trans [Re: plat]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: Colorado
Drive it; if the noise starts to worsen quickly or suddenly then have it looked at. Over the years I have had several manuals that had some noise in one gear or another (usually first or o/d) and none failed or had an issue.


Edited by Kuato (08/14/17 07:00 AM)
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#4488108 - 08/14/17 07:27 AM Re: first gear whine- manual trans [Re: plat]
E150GT Offline


Registered: 03/11/12
Posts: 1109
Loc: San Antonio, TX
My Mazda is like this. Done it since day one. I call it my first gear supercharger.
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1984 Mercedes-Benz 300SD - 100k
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2016 Mazda6 Touring 6MT - 56k 10w30

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#4488111 - 08/14/17 07:32 AM Re: first gear whine- manual trans [Re: plat]
TinyVoices Offline


Registered: 09/12/16
Posts: 485
Loc: Vienna, VA
What car is this? There is a good chance that 1st is a close to straight cut gear and will whine.
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#4488235 - 08/14/17 09:56 AM Re: first gear whine- manual trans [Re: plat]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
Quote:
What car is this?
Yep.


I would first make sure it is not the clutch's throw-out bearing since I have seen throw-out bearings make more noise in one gear than another because of different mechanical/coupling oscillations.

Most likely it is gear cut as others have stated.

Since a heavier grade of oil did not quench the noise, I doubt the bearings are at fault.

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#4488412 - 08/14/17 01:45 PM Re: first gear whine- manual trans [Re: MolaKule]
plat Offline


Registered: 08/12/17
Posts: 2
Loc: Los Angeles
Thank you guys for the input.

The car is a 4th gen Maxima.

I was concerned because folks on the Maxima forums seem to agree that 1st gear shouldn't make any noise, although nothing I have found says definitively that it's helical cut.

Glad to hear it's probably not the bearings.


I thought about the throw-out bearing too but it's dead silent when I push in the clutch pedal and the car just had a clutch job done before I bought it so I would hope the T/O bearing is new/good.


Edited by plat (08/14/17 01:47 PM)

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#4488413 - 08/14/17 01:47 PM Re: first gear whine- manual trans [Re: MolaKule]
ecotourist Offline


Registered: 07/09/08
Posts: 1067
Loc: British Columbia, Canada
I agree. Most likely straight cut gears (which don't have the gentle hand off from gear to gear you would get with helical cut gears).

So drive it and see if it gets any worse.

Meanwhile you can tell passengers, "Straight cut gears, they whine a bit, but they're very strong."
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