Diff whine on decel please help
Thread Starter
Melting Slicks
Joined: Sep 2008
Posts: 2,304
Likes: 4
From: foothills of Northern California
Diff whine on decel please help
My C6 has been bulletproof so far with 20K. Just got new tires that are very quite so of course I will be able to hear new things from the Vette.
I have a very slight whine from what sounds like the diff on deceleration in the higher gears. I have heard this in other cars also.
Any thoughts on this, is it normal? Do you have it in your Vette.
I had Diff fluid change @ 5 K.
A6 trans.
Thnx
I have a very slight whine from what sounds like the diff on deceleration in the higher gears. I have heard this in other cars also.
Any thoughts on this, is it normal? Do you have it in your Vette.
I had Diff fluid change @ 5 K.
A6 trans.
Thnx
Le Mans Master
Joined: Apr 2006
Posts: 5,933
Likes: 13
From: The Beautiful Inland Empire WA.
The rear diffs on Corvettes have a critical clearance issue between the ring and pinion and if they are off at all, are famous for whining -- especially on deceleration.
Perhaps with the old tires you did not hear it and if you can turn up the radio to erase it now, its probably not a problem. If it is louder than that, it might need some attention --- which is NOT cheap. You have to drop the entire back end of the car, suspension and all to R and R it......almost a full day's labor = $$'s....
Perhaps with the old tires you did not hear it and if you can turn up the radio to erase it now, its probably not a problem. If it is louder than that, it might need some attention --- which is NOT cheap. You have to drop the entire back end of the car, suspension and all to R and R it......almost a full day's labor = $$'s....
Safety Car
Joined: Dec 2006
Posts: 4,642
Likes: 9
From: Dalllas/Ft Worth Area TX
Sound reasonable!
The rear diffs on Corvettes have a critical clearance issue between the ring and pinion and if they are off at all, are famous for whining -- especially on deceleration.
Perhaps with the old tires you did not hear it and if you can turn up the radio to erase it now, its probably not a problem. If it is louder than that, it might need some attention --- which is NOT cheap. You have to drop the entire back end of the car, suspension and all to R and R it......almost a full day's labor = $$'s....
Perhaps with the old tires you did not hear it and if you can turn up the radio to erase it now, its probably not a problem. If it is louder than that, it might need some attention --- which is NOT cheap. You have to drop the entire back end of the car, suspension and all to R and R it......almost a full day's labor = $$'s....
Team Owner
Joined: Nov 2006
Posts: 21,136
Likes: 212
From: Long Island New York
Every time I put new tires on any car I had in the past, the tire noise was louder initially. New treads on tires make more noise than ones which are worn. Im a little surprised you say its quieter than the older tires?
These new tire tread sounds can be confused with rear end noise. Just a thought.
These new tire tread sounds can be confused with rear end noise. Just a thought.
Safety Car
Joined: Nov 2007
Posts: 4,435
Likes: 874
From: Bay Area CA
My C6 has been bulletproof so far with 20K. Just got new tires that are very quite so of course I will be able to hear new things from the Vette.
I have a very slight whine from what sounds like the diff on deceleration in the higher gears. I have heard this in other cars also.
Any thoughts on this, is it normal? Do you have it in your Vette.
I had Diff fluid change @ 5 K.
A6 trans.
Thnx
I have a very slight whine from what sounds like the diff on deceleration in the higher gears. I have heard this in other cars also.
Any thoughts on this, is it normal? Do you have it in your Vette.
I had Diff fluid change @ 5 K.
A6 trans.
Thnx
Last edited by Mike's LS3; Aug 3, 2010 at 07:32 PM.
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Safety Car
Joined: Dec 2006
Posts: 4,642
Likes: 9
From: Dalllas/Ft Worth Area TX
Your right on!
Every time I put new tires on any car I had in the past, the tire noise was louder initially. New treads on tires make more noise than ones which are worn. Im a little surprised you say its quieter than the older tires?
These new tire tread sounds can be confused with rear end noise. Just a thought.
These new tire tread sounds can be confused with rear end noise. Just a thought.
Thread Starter
Melting Slicks
Joined: Sep 2008
Posts: 2,304
Likes: 4
From: foothills of Northern California
Every time I put new tires on any car I had in the past, the tire noise was louder initially. New treads on tires make more noise than ones which are worn. Im a little surprised you say its quieter than the older tires?
These new tire tread sounds can be confused with rear end noise. Just a thought.
These new tire tread sounds can be confused with rear end noise. Just a thought.
Team Owner
Joined: Nov 2006
Posts: 21,136
Likes: 212
From: Long Island New York
Thread Starter
Melting Slicks
Joined: Sep 2008
Posts: 2,304
Likes: 4
From: foothills of Northern California
I have an 08 (32k miles) with a slight decel whine 74-67 mph in 4th, 5th and 6th gears. If I put it in neutral, press in the clutch or apply the gas it will go away. This has occurred since new. The service techs have driven and documented the whine. The rear differential fluid has been changed twice, whine is still there. We suspect the back lash setting on the ring and pinion gear is off slightly from the factory. My concern is the irregular wear on the ring and pinion gears and the affected on longevity. I plan on returning soon and push for a new differential. I still have about 2 1/2 yrs. left on the power-train warranty.
I think I should have it listened to at the dealer ( I have GMPP until 2013) Would you be so bold as to tell me where you are in Northern Cal? This seems like a issue where GM or a dealer could really play dumb.
Safety Car
Joined: Nov 2007
Posts: 4,435
Likes: 874
From: Bay Area CA
Hey Mike, Thnx for your post. I am thinking along those lines also.
I think I should have it listened to at the dealer ( I have GMPP until 2013) Would you be so bold as to tell me where you are in Northern Cal? This seems like a issue where GM or a dealer could really play dumb.
I think I should have it listened to at the dealer ( I have GMPP until 2013) Would you be so bold as to tell me where you are in Northern Cal? This seems like a issue where GM or a dealer could really play dumb.
Last edited by Mike's LS3; Jan 23, 2011 at 01:59 PM.
Safety Car
Joined: Dec 2006
Posts: 4,642
Likes: 9
From: Dalllas/Ft Worth Area TX
Drifting
Joined: May 2005
Posts: 1,419
Likes: 2
From: "Cedar Valley" (Northeastern) Iowa
Maybe it wasn't broken in properly .... the main reason for the "500 mile break in process" is the the differntial... not the engine.
Did you buy it used ... if you bought it new, did you follow the break in process?
Did you buy it used ... if you bought it new, did you follow the break in process?
Last edited by MachAll 2005; Aug 4, 2010 at 03:01 PM.
Melting Slicks
Joined: Sep 2004
Posts: 3,488
Likes: 27
From: Long Island NY
