Ringing noise from 727 at idle
11-27-2011, 07:40 PM
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Ringing noise from 727 at idle
Hi,
I'm getting a strange noise from my trans at idle in gear. It sounds like perhaps an internal servo/piston is oscillating, and making a high pitched metallic rattle/ringing sound. It's been going on for a while and can't really associate it with any changes to my setup.
I originally thought it was the metering rods in my Edlebrock carb slapping up and down due to low idle vacuum. The trans has a transgo improver kit in it and I don't recall any issues at that time it was installed. The problems seemed to have started when a rebuilt 440 was installed about a year ago. It has a mild Comp Cams grind in it and all else is stock. Converter is a stock unit. Any thoughts would be helpful.
Thanks,
Rob
'73 B'Cuda 440/727
I'm getting a strange noise from my trans at idle in gear. It sounds like perhaps an internal servo/piston is oscillating, and making a high pitched metallic rattle/ringing sound. It's been going on for a while and can't really associate it with any changes to my setup.
I originally thought it was the metering rods in my Edlebrock carb slapping up and down due to low idle vacuum. The trans has a transgo improver kit in it and I don't recall any issues at that time it was installed. The problems seemed to have started when a rebuilt 440 was installed about a year ago. It has a mild Comp Cams grind in it and all else is stock. Converter is a stock unit. Any thoughts would be helpful.
Thanks,
Rob
'73 B'Cuda 440/727
Last edited by rfarmelo; 11-27-2011 at 07:41 PM. Reason: add signature
11-28-2011, 05:11 PM
#2
Weak PCV valve will make that sound.
But I would Grab an old stethoscope from Ebay and pull the head off and connect a piece of vacuum hose. It will definitely tell you where eactly the noise is coming from cause you can source the noise withing a couple centimeters.
I just used this to find a dry seal in a rack and pinion that had me chasing my tail for a while.
But I would Grab an old stethoscope from Ebay and pull the head off and connect a piece of vacuum hose. It will definitely tell you where eactly the noise is coming from cause you can source the noise withing a couple centimeters.
I just used this to find a dry seal in a rack and pinion that had me chasing my tail for a while.
11-28-2011, 07:16 PM
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Weak PCV valve will make that sound.
But I would Grab an old stethoscope from Ebay and pull the head off and connect a piece of vacuum hose. It will definitely tell you where eactly the noise is coming from cause you can source the noise withing a couple centimeters.
I just used this to find a dry seal in a rack and pinion that had me chasing my tail for a while.
But I would Grab an old stethoscope from Ebay and pull the head off and connect a piece of vacuum hose. It will definitely tell you where eactly the noise is coming from cause you can source the noise withing a couple centimeters.
I just used this to find a dry seal in a rack and pinion that had me chasing my tail for a while.
11-28-2011, 11:15 PM
#4
Mopar Lover
It could honestly be a multitude of things...
As previously state, buy a stethoscope, very handy for diagnosing noise concerns.
Have someone sit in the car, foot on brake, e-brake on, tires chalked on both sides and in gear and probe around the engine and transmission.
As previously state, buy a stethoscope, very handy for diagnosing noise concerns.
Have someone sit in the car, foot on brake, e-brake on, tires chalked on both sides and in gear and probe around the engine and transmission.
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