: Annoying noise 45mph to 55mph



bpm
10-16-07, 11:37 PM
I been to the dealer several times for this issues and they keep telling me that its running to factory spec. I get a humming noise or whining noise when driving at 45 to 55 mph while applying light throttle. No throttle I don't hear anything and full throttle it won't hear anything since the engine over powers the noise. Its very irritating when trying to drive at a consistent speed and listening to that noise. If anyone has any ideas please feel free to let me know.

RobWilson
10-16-07, 11:52 PM
My guess is the 3.73 gears. I can hear a little gear whine from my car in the same mph range.

I have 4.10s in my C5 and the whine is a little louder than on my V and is most noticeable around the same mph range.

bpm
10-17-07, 12:06 AM
Can anything be done to bring the noise down. BTW its an 04 with 50k miles on it.

The Tony Show
10-17-07, 12:13 AM
Take the trunk liner out and Dynamat it. Some people have success with changing the fluid in the gears, but it always comes back.

SkullV
10-17-07, 12:40 AM
I have the same exact noise, its our differential...eventually it will get so bad that the dealer will hear it or it will blow up!

GMBOUND
10-17-07, 01:16 AM
I got a lil whine in 4th & 5th

fredcook
10-17-07, 09:52 AM
I been to the dealer several times for this issues and they keep telling me that its running to factory spec. I get a humming noise or whining noise when driving at 45 to 55 mph while applying light throttle. No throttle I don't hear anything and full throttle it won't hear anything since the engine over powers the noise. Its very irritating when trying to drive at a consistent speed and listening to that noise. If anyone has any ideas please feel free to let me know.

Mine did the same (38k on a 05). It was the rear end. Dealer replaced it with an 06/07 version. Hum be gone.

rand49er
10-17-07, 10:44 AM
... its our differential...


... the rear end. ...Bingo!

As it gets worse, the range of speeds that you'll hear it will widen.

If you're on warranty still, dealer should replace it with no questions asked ... ABSOLUTELY NO QUESTIONS ASKED! If they resist, go to another dealer.

OldRoadDawg
10-17-07, 11:45 AM
Eh... my base CTS did it for 30K miles. The V has had the whine for 35K miles. I always know when I'm going 43 - 45 mph. Haven't replaced a diff yet.

bpm
10-17-07, 07:55 PM
well my rear has been replaced 5 times according to my service record. I guess i have to go back again.

fredcook
10-17-07, 10:33 PM
well my rear has been replaced 5 times according to my service record. I guess i have to go back again.

The question might be... were they replaced with an 04/05 version, or an 06/07 version? They are visually different (there is a comparison picture somewhere on the threads).

I'm not sure, but it seems like most of the dying rears are the older one. I could be wrong. I wonder if anyone has done a poll on that question.

JimmyH
10-18-07, 01:04 AM
My rear end whines some, I rub a little Desitin on it and it goes away.

SkullV
10-18-07, 03:37 AM
I would pay 200k for that new camaro if it could do exactly what it does in your sig !

JimmyH
10-18-07, 10:02 AM
if the camaro could do that, I think it would cost significantly more than $200k

SkullV
10-18-07, 02:00 PM
noone would have to know