Help! High pitched whine
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Instructor
Joined: Apr 2011
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From: Racine WI
Help! High pitched whine
Reposted from General Forum:
I have a high pitched whine cruising at 70 mph, 1800 rpm. Sounds like it is coming from the back of the engine, maybe the belhousing or torque tube. If I back off, push in the clutch or take it out of gear, it goes away. Anybody experience this before? Where should I start trying to troubleshoot?
I have a high pitched whine cruising at 70 mph, 1800 rpm. Sounds like it is coming from the back of the engine, maybe the belhousing or torque tube. If I back off, push in the clutch or take it out of gear, it goes away. Anybody experience this before? Where should I start trying to troubleshoot?
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
Reposted from General Forum:
I have a high pitched whine cruising at 70 mph, 1800 rpm. Sounds like it is coming from the back of the engine, maybe the belhousing or torque tube. If I back off, push in the clutch or take it out of gear, it goes away. Anybody experience this before? Where should I start trying to troubleshoot?
I have a high pitched whine cruising at 70 mph, 1800 rpm. Sounds like it is coming from the back of the engine, maybe the belhousing or torque tube. If I back off, push in the clutch or take it out of gear, it goes away. Anybody experience this before? Where should I start trying to troubleshoot?
Thread Starter
Instructor
Joined: Apr 2011
Posts: 114
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From: Racine WI
Try it in 5th gear, same engine rpm and see if you still have the noise. If not, it would point to something in the trans. When was the last oil change of trans fluid? If the noise is still there in 5th gear I would be looking at the diff. Any oil leaks back there? When was the last time the oil was changed in the diff?
Transmission was upgraded to DTE Stage 2 w/4:10 gears and HD output shaft gears about 5,000 miles ago.
Tech Contributor
Joined: May 2008
Posts: 2,843
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From: Howell Michigan
St. Jude Donor '09-'10-'11
Not sure when any of the fluids were changed. I just bought the car back in April, however only has 17,000 miles. The noise doesn't sound like it is coming from the rear, but I guess could be traveling up the torque tube. When it is at it's loudest you would swear it was coming out of the dashboard.
Transmission was upgraded to DTE Stage 2 w/4:10 gears and HD output shaft gears about 5,000 miles ago.
Transmission was upgraded to DTE Stage 2 w/4:10 gears and HD output shaft gears about 5,000 miles ago.
Is this a new noise or has it made it since you got it?
Melting Slicks
Joined: Dec 2003
Posts: 3,315
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From: Near Jacksonville Fl.
"Try the 5th gear in place of 6th gear to see if it is diff or trans".
Hmmm, better make that 4th gear in 5th your still running through the headset.
4th is direct drive in your 6 speed.
Hmmm, better make that 4th gear in 5th your still running through the headset.
4th is direct drive in your 6 speed.
Thread Starter
Instructor
Joined: Apr 2011
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From: Racine WI
Just started. The only thing that has changed from the last time I drove it, is that I changed out my clutch fluid using the Ranger method. I am getting ready to go out and try some of the suggestions with other gears/speeds and will check with slight pressure on the clutch as well.
Thread Starter
Instructor
Joined: Apr 2011
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From: Racine WI
Ahh, so the diff has other than stock ratio. If the ring/pinion wasn't set just right it can cause a whine. Direction can be hard to tell sometime with the C5 powertrain setup. The high frequency noises can travel down the torque tube and radiate from the larger sufaces areas, like the front bell housing. Try the 5th gear in place of 6th gear to see if it is diff or trans. If the history on oil changes is unknown if it were my car I'd change the oil so I have a baseline.
Is this a new noise or has it made it since you got it?
Is this a new noise or has it made it since you got it?
This is a new noise.
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Thread Starter
Instructor
Joined: Apr 2011
Posts: 114
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From: Racine WI
Ok, took it out for a drive again. Looks like the noise starts in at around 45mph (in 3rd gear). Not as pronounced and not as high pitched. Noise is present in 3rd, 4th, 5th, and 6th. However it is loudest in 6th between 70-80 mph. Looking like something in the differential.
Anyone recommend a good shop in the Milwaukee - Chicago areas for rear end work (diagnosis and repair)? Or, should I look at going back to DTE, being they originally built the current unit?
Anyone recommend a good shop in the Milwaukee - Chicago areas for rear end work (diagnosis and repair)? Or, should I look at going back to DTE, being they originally built the current unit?
