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Rear end whine

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Old 05-14-2012, 09:10 PM   #1
Bob Chapman
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Default Rear end whine

My 2002 6 spd.with 82000 miles is developing a whine from what seems to be the rear. I get it above 60mph and when the drive system is slightly pulling but not on acceleration or deceleration. Happens in 5th and 6th gear. Put Red Line fluids in tranny and differential about 30.000 miles ago. The whine seems to be getting slightly louder over time. It's not loud - just annoying and new. Ideas?
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Old 05-14-2012, 09:53 PM   #2
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Originally Posted by Bob Chapman View Post
My 2002 6 spd.with 82000 miles is developing a whine from what seems to be the rear. I get it above 60mph and when the drive system is slightly pulling but not on acceleration or deceleration. Happens in 5th and 6th gear. Put Red Line fluids in tranny and differential about 30.000 miles ago. The whine seems to be getting slightly louder over time. It's not loud - just annoying and new. Ideas?
This is a classic symptom of ring and pinion gears making noise. The noise happens around 65-70 mph in overdrives. If you can't live with it, time for new gears.
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Old 05-14-2012, 10:19 PM   #3
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Most likely will get louder as well Mine took around 3k miles to go from a slight hum to downright annoying and not being able to use the radio to cover the noise.
Time for 3.90s from Rick (see above)
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Old 05-15-2012, 12:56 AM   #4
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Does it start off as a low high-pitched frequency sound?

I've notice this on the used 3.42 diff that was just put in. Only under load.
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Old 05-15-2012, 11:07 AM   #5
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Most gear whines are on the load (accelerating) side. Usually the noise is gone during coasting or decel. The noise is similar to a straight cut gears in a transmission.
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Old 06-02-2012, 10:32 PM   #6
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I'm getting a similar whine that starts at 50mph. is the fix just new gears?
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Old 06-03-2012, 11:25 AM   #7
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I'm getting a similar whine that starts at 50mph. is the fix just new gears?
Yes, but I would check to make sure it's not a rear hub noise first.
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Old 06-03-2012, 10:03 PM   #8
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Both my Trans Am GT and my C5 Anniversary Edition (both with T-56 and 3.42 gears) have whinned at highway speeds. Seems I was told that it was the tranny that was the culprit, but I cannot remember. Mine have not increased in volume ever, so I am just going to live with it.....or turn the stereo up louder. LOL
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Old 08-20-2012, 07:49 PM   #9
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im having a gear whine also in my 02 z06 , it starts at any speed when im on throttle, if im on the floor with the throttle it goes away, if Im just cruizing I hear it more often.
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Old 08-21-2012, 03:07 AM   #10
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Yes the ring and pinion are the cause. I swapped a 3.42 diff out of a Z06 into my 99 A4 and found out why they removed it. It whines badly all the time. If you can live with it, it doesn't hurt anything. If not, upgrade time
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Old 08-21-2012, 05:19 AM   #11
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Quote:
Originally Posted by Rick@RKT56 View Post
Most gear whines are on the load (accelerating) side. Usually the noise is gone during coasting or decel. The noise is similar to a straight cut gears in a transmission.
I have a noise that is kind of opposite of this. Most noticeable on cruise, only slightly noticeable on acceleration, completely gone on deceleration. All after it's warmed up and at operating temp. I haven't figured it out yet.
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Old 08-21-2012, 11:19 AM   #12
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I have a noise that is kind of opposite of this. Most noticeable on cruise, only slightly noticeable on acceleration, completely gone on deceleration. All after it's warmed up and at operating temp. I haven't figured it out yet.
I should have been more specific. The noise is most evident on part throttle acceleration (10-30% throttle). The noise disappears under hard acceleration and decel.
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Old 08-26-2012, 09:52 AM   #13
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I've had this noise for thousands of miles and it doesn't hurt anything. It's not too bad so I haven't done anything about it. I've got 108k miles and it has never gotten any worse.
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Old 08-26-2012, 01:24 PM   #14
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My 3.90``s have been whining for over 30,000 miles now, loudest at 50-65 mph. sometimes louder than other times but not getting any worse. last diff change no metal in old oil so I`m living with it.
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Old 12-22-2012, 11:15 PM   #15
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Quote:
Originally Posted by Rick@RKT56 View Post
This is a classic symptom of ring and pinion gears making noise. The noise happens around 65-70 mph in overdrives. If you can't live with it, time for new gears.

Why does this happen? and in my case only or mostly in 6th gear?
not enough 'load' on the gears,
geez i only have 40,000 mi (2004 year ) and it's been getting worse very annoying like others have said.
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Old 12-23-2012, 11:02 AM   #16
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Why does this happen? and in my case only or mostly in 6th gear?
not enough 'load' on the gears,
geez i only have 40,000 mi (2004 year ) and it's been getting worse very annoying like others have said.
They say its from improper backlash of the ring and pinion. I find it had to believe that so many mistakes were made from the factory as this happens to so many people. I think that hard driving and abuse causes the gears to form a bad wear pattern. An improper break in and or allot of spirited driving will wipe out the gear teeth surface and make them noisy.
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Old 12-23-2012, 12:00 PM   #17
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Quote:
Originally Posted by Dennis Wilson View Post
My 3.90``s have been whining for over 30,000 miles now, loudest at 50-65 mph. sometimes louder than other times but not getting any worse. last diff change no metal in old oil so I`m living with it.
This particular diff was whinning and the ring and pinion gears just ate each other up. This magnet was the result.

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Old 12-23-2012, 03:58 PM   #18
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Wow, sweet example of a magnet's lines of force.
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Old 12-23-2012, 07:10 PM   #19
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NukeC5

Im not sure that "spirited" driving would be the cause of this. It is a Corvette after all and spirited driving is what the car was made for. I am new to this forum but I have been doing alot of research on the C5 Vettes. A Corvette with 40k miles on it should not have gear noise (unless maybe they ran it dry of lube at LeMans) I think maybe this was a Factory flaw that went unnoticed.
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Old 12-24-2012, 11:48 AM   #20
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Quote:
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NukeC5

Im not sure that "spirited" driving would be the cause of this. It is a Corvette after all and spirited driving is what the car was made for. I am new to this forum but I have been doing alot of research on the C5 Vettes. A Corvette with 40k miles on it should not have gear noise (unless maybe they ran it dry of lube at LeMans) I think maybe this was a Factory flaw that went unnoticed.
It may be in some cases, but if you stick around this forum awhile you will find that gear noise is a problem for way to many C5 owners to be factory flaws. The words "spirited driving" to me and (and "allot of spirited driving" at that) to me means the guys that are constantly on the throttle or brakes. The gears never have a chance to form a smooth wear pattern which leads to a surface that whines.
The Corvette is still a car made from the same parts as any other Chevy V8. Harsh driving will lead to owning a harshly driven car that shows it like any other car.
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