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first gear whine- manual trans #4487986
08/13/17 11:06 PM
08/13/17 11:06 PM
Joined: Aug 2017
Posts: 2
Los Angeles
plat Offline OP
plat  Offline OP
Joined: Aug 2017
Posts: 2
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.

Re: first gear whine- manual trans [Re: plat] #4488076
08/14/17 05:46 AM
08/14/17 05:46 AM
Joined: Dec 2003
Posts: 9,922
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,922
Florida, Cape Coral
Often times the first gear is not helical cut so it is by nature nosier than the other gears. Ed


CX5 Touring 2.5L :-)
Re: first gear whine- manual trans [Re: plat] #4488088
08/14/17 06:00 AM
08/14/17 06:00 AM
Joined: Oct 2005
Posts: 7,094
Colorado
Kuato Offline
Kuato  Offline
Joined: Oct 2005
Posts: 7,094
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.

Last edited by Kuato; 08/14/17 06:00 AM.

Thick vs Thin test: 15k / 43k miles complete
Re: first gear whine- manual trans [Re: plat] #4488108
08/14/17 06:27 AM
08/14/17 06:27 AM
Joined: Mar 2012
Posts: 1,366
San Antonio, TX
E150GT Offline
E150GT  Offline
Joined: Mar 2012
Posts: 1,366
San Antonio, TX
My Mazda is like this. Done it since day one. I call it my first gear supercharger.


1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 57k 10w30
2006 Buick Lucerne CXL 3.8 31k 5w30
Re: first gear whine- manual trans [Re: plat] #4488111
08/14/17 06:32 AM
08/14/17 06:32 AM
Joined: Sep 2016
Posts: 520
Fairfax, VA
TinyVoices Online content
TinyVoices  Online Content
Joined: Sep 2016
Posts: 520
Fairfax, VA
What car is this? There is a good chance that 1st is a close to straight cut gear and will whine.


2010 Mazda RX8 Sport - 37k miles - ????
2006 Toyota Matrix XR AWD (Wife) - 130k miles - Valvoline Max Life 5w30
Re: first gear whine- manual trans [Re: plat] #4488235
08/14/17 08:56 AM
08/14/17 08:56 AM
Joined: Jun 2002
Posts: 19,496
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,496
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.


Scars remind us of where we have been, but do not have to dictate where we are going.
Re: first gear whine- manual trans [Re: MolaKule] #4488412
08/14/17 12:45 PM
08/14/17 12:45 PM
Joined: Aug 2017
Posts: 2
Los Angeles
plat Offline OP
plat  Offline OP
Joined: Aug 2017
Posts: 2
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.

Last edited by plat; 08/14/17 12:47 PM.
Re: first gear whine- manual trans [Re: MolaKule] #4488413
08/14/17 12:47 PM
08/14/17 12:47 PM
Joined: Jul 2008
Posts: 1,111
British Columbia, Canada
ecotourist Offline
ecotourist  Offline
Joined: Jul 2008
Posts: 1,111
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."


2000 BMW 528i 5MT
2007 Honda Accord EX-L 4Door V6 6MT

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