Diff whine
Thread Starter
Pro
Joined: Oct 2006
Posts: 551
Likes: 0
From: N.J.
Diff whine
I have what I'll call a diff whine and at different speeds it goes away when decel'ing, it is loud at times depending on speed and gear, while driving yesterday the sound/vibration was actually radiating into my drivers seat,but then on the other hand it almost feels or sounds like congestion in the exhaust, heavy throttle and you can hear/feel the drone, light throttle and coasting it goes away.
My question is do you think by jacking the rear end up and running it in gear with the wheels off the ground i may replicate the sound/vibration.
Also i just changed the gear lube and had the old stuff analized by Blackstone Labs, nothing jumped out as abnormal with 33,000 miles on factory lube.
BTW i have headers, aftermarket cats and Ti ex
My question is do you think by jacking the rear end up and running it in gear with the wheels off the ground i may replicate the sound/vibration.
Also i just changed the gear lube and had the old stuff analized by Blackstone Labs, nothing jumped out as abnormal with 33,000 miles on factory lube.
BTW i have headers, aftermarket cats and Ti ex
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
It would help to know what model and year your car is. Has there been any mods? Is this a new issue or has it been there for a while?
It would be worth getting the car in the air to at least check the exhaust system for ground-outs (touching places it should not).
Other than changing fluid has there been any changes to the diff, mounts, or has the car been lowered?
It would be worth getting the car in the air to at least check the exhaust system for ground-outs (touching places it should not).
Other than changing fluid has there been any changes to the diff, mounts, or has the car been lowered?
Thread Starter
Pro
Joined: Oct 2006
Posts: 551
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From: N.J.
Sorry, i have a 04' 6sp w/cam, headers,UD Pulley Random Tech hi flo cats and Ti ex.
I ran it with the wheels off the ground and as i expected (without a load on the drivetrain) nothing, i also for the second time checked for exh leaks by looking for exh steam (it was chilly today) and didn't see any except for what exited the tailpipes. I also tapped the cats with a large rubber mallet to hear for rattles and didnt hear anything abnormal.
Under the hood there didn't seem to be any leaks(steam or sound) from the header flanges that attach to the heads.
Thers one last thing i want to eliminate tommorrow and thats the upsized tires/rims recently installed(6 montha ago).
i have the OE's and while i would like to temp swap just the rears i dont think i can run 18's all around.
so i think i'll have to swap all four back to the originals and go for a ride, i dont think thats the prob cause iv had this combo on and i wasn't having any issues, also im not a hard driver,ie burnouts etc.
mostly highway cruiser
If nothing comes of the tire swap i guess im off to a tuner shop for professional diagnosis.
I ran it with the wheels off the ground and as i expected (without a load on the drivetrain) nothing, i also for the second time checked for exh leaks by looking for exh steam (it was chilly today) and didn't see any except for what exited the tailpipes. I also tapped the cats with a large rubber mallet to hear for rattles and didnt hear anything abnormal.
Under the hood there didn't seem to be any leaks(steam or sound) from the header flanges that attach to the heads.
Thers one last thing i want to eliminate tommorrow and thats the upsized tires/rims recently installed(6 montha ago).
i have the OE's and while i would like to temp swap just the rears i dont think i can run 18's all around.
so i think i'll have to swap all four back to the originals and go for a ride, i dont think thats the prob cause iv had this combo on and i wasn't having any issues, also im not a hard driver,ie burnouts etc.
mostly highway cruiser
If nothing comes of the tire swap i guess im off to a tuner shop for professional diagnosis.
Le Mans Master
Joined: Dec 2006
Posts: 7,251
Likes: 16
From: Phoenix Arizona
Sorry, i have a 04' 6sp w/cam, headers,UD Pulley Random Tech hi flo cats and Ti ex.
I ran it with the wheels off the ground and as i expected (without a load on the drivetrain) nothing, i also for the second time checked for exh leaks by looking for exh steam (it was chilly today) and didn't see any except for what exited the tailpipes. I also tapped the cats with a large rubber mallet to hear for rattles and didnt hear anything abnormal.
Under the hood there didn't seem to be any leaks(steam or sound) from the header flanges that attach to the heads.
Thers one last thing i want to eliminate tommorrow and thats the upsized tires/rims recently installed(6 montha ago).
i have the OE's and while i would like to temp swap just the rears i dont think i can run 18's all around.
so i think i'll have to swap all four back to the originals and go for a ride, i dont think thats the prob cause iv had this combo on and i wasn't having any issues, also im not a hard driver,ie burnouts etc.
mostly highway cruiser
If nothing comes of the tire swap i guess im off to a tuner shop for professional diagnosis.
I ran it with the wheels off the ground and as i expected (without a load on the drivetrain) nothing, i also for the second time checked for exh leaks by looking for exh steam (it was chilly today) and didn't see any except for what exited the tailpipes. I also tapped the cats with a large rubber mallet to hear for rattles and didnt hear anything abnormal.
Under the hood there didn't seem to be any leaks(steam or sound) from the header flanges that attach to the heads.
Thers one last thing i want to eliminate tommorrow and thats the upsized tires/rims recently installed(6 montha ago).
i have the OE's and while i would like to temp swap just the rears i dont think i can run 18's all around.
so i think i'll have to swap all four back to the originals and go for a ride, i dont think thats the prob cause iv had this combo on and i wasn't having any issues, also im not a hard driver,ie burnouts etc.
mostly highway cruiser
If nothing comes of the tire swap i guess im off to a tuner shop for professional diagnosis.
I bet it is the Pilot Bearing. That is very common on C5's and doesn't really hurt anything. G/L 
Thread Starter
Pro
Joined: Oct 2006
Posts: 551
Likes: 0
From: N.J.
OH the pilot bearing as in the clutch?
Le Mans Master
Joined: Dec 2006
Posts: 7,251
Likes: 16
From: Phoenix Arizona
Instructor
Joined: Jun 2005
Posts: 146
Likes: 1
From: Milpitas CA
Seems like the pilot bearing shouldn't make any noise with the clutch engaged. As long as the clutch disk and the flywheel are rotating at the same speed, the pilot bearing should not be running at all. Spinning in space, yes, but not actually running.
Pat
Pat
Le Mans Master
Joined: Dec 2006
Posts: 7,251
Likes: 16
From: Phoenix Arizona
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whine
I have a 02 Z06 and it has whined since I got it3 years ago. It is mild so I have not even had it checked, although I have changed the fluid twice just to see if it would go away. Its also weird sometimes if I really hammer it and shift hard getting on the freeway it doesn't whine at all? Figure that one out??
