Transmission “howls”
I have a 2003 350z that I bought new. The car’s transmission exhibited the problems common in early 350z manuals: “Notchy” shifts and synchromesh failure (mine was failing in 5th gear). Nissan kindly replaced both the transmission (with the CD009 model) and clutch assembly under warranty at around 40k miles.
That solved the problems and all was good until about 2 years ago (at about 100k miles total miles on the car, and 60K on the new transmission and clutch assembly), when the transmission started to emit a low howl, but only when the air temperature was cold (below freezing), and only when in first or reverse gear. As soon as I got the car rolling (shifted into second gear) or the transmission warmed just slightly, the noise was gone. I thought the noise must be the throw out bearing, so I replaced this and installed a new clutch assembly. The same noise remains.The noise must be coming from the transmission. The noise has no effect on operation; it just seems to be “cosmetic.” Has anyone seen or heard of this? Thanks. --Spike |
Never happened to me on either my 350z or g35 (sold), but I would definitely check the remaining drivetrain...driveshaft joints, diff and axles, fluid levels.
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I've got a cd09 with same howling when cold, goes away warm. I've heard of others having it, and haven't heard of it being linked to something failing, but I don't have any clue as to what it is other than the transmission.
The sound was present before my transmission fluid change and present afterwards, so I don't think it is related to improper fluid. |
Gears will make noise to some degree, what fluid are you using?
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Originally Posted by DarkZ03
(Post 10983981)
Gears will make noise to some degree, what fluid are you using?
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I have done additional research on the transmission noise I describe in the first post on this thread. I searched this site, and also did a Google search of the web. Here is some common comments:
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Now that you describe it more, my year or so old cd009 does whine or more like "whirr" (not transmission chatter) when in neutral an cold...something i hadnt heard on this platform before. And I have heard a lot of transmission chatter, and this is something different
I also noticed that with the car in the air, with the clutch pedal out (clutch engaged), the rear wheels spin slowly on their own, then as it heats up the wheels stop moving. If I clutch in (disengage the clutch) they stop. At any time if I touch the wheel it stops moving so there is very little torque being applied to the wheels...when it was newer it would do it more, but now as its had some miles it spins the rear wheels for less time before it warms up and stops. But, no noise when in gear and moving, either cold or warmed up. Which is why initially I didnt mention the above. |
^^ Yes. When my car is in neutral and the clutch pedal is out (not pressed down), I hear the noise. If I push the clutch pedal down, the noise goes away.
So... When there is a load on the transmission, I hear the noise. |
I think its normal and a result of the improvements in the latest cd00a transmissions. Mine is actually a cd00a.
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^^ I agree. I'm not going to worry about the noise. Transmission is functioning normally (other than the noise). Thanks for posting.
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Originally Posted by guitman32
(Post 10984092)
I think its normal and a result of the improvements in the latest cd00a transmissions. Mine is actually a cd00a.
Originally Posted by Spike100
(Post 10984097)
^^ I agree. I'm not going to worry about the noise. Transmission is functioning normally (other than the noise). Thanks for posting.
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