Salisbury MD
Safety Car
Joined: Oct 2000
Posts: 3,547
Likes: 12
From: Carbondale Pa.
What sort of noise is it making & when ? Is it coming from the differential or from the axle stubs. Possible that maybe the posi clutches are chattering when you turn left or right ? Maybe all you need is a complete fluid drain and change with the proper additive . Other then that,,,,,,good luck. Peace,,, moosie 
Melting Slicks
Joined: Jul 2010
Posts: 2,503
Likes: 33
From: McGrady NC
St. Jude Donor '15-'16
To be serious for a change, Moosie is right. Most of the real differential noise can be cured with a fluid change with new posi additive. U-joints typically "clunk" or have a rattling noise if they are worn but a posi unit needed fresh fluid can shake the whole car particularly when going around a curve as in at a traffic intersection. It can feel like you are driving over something. A rhythmic whine can be old differential fluid or a bad bearing in the differential or at the trailing arm. Can you describe the noise?
Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
the clunks and bangs from old diff oil can get pretty loud in a parking lot at full steering lock.The clutches load and unload with a bang and the posi additive smooths that out. But a whirling or steady rumble noise is bearings, an oil change might quiet it down if the damage isn't too bad 
Thread Starter
Pro
Joined: May 2001
Posts: 571
Likes: 5
From: usa
ok. I had added posi lube, but never changed the fluid/oil I'll give that a try.
there is a video in my other post
http://forums.corvetteforum.com/c3-t...nts-video.html
I was going to say "I promise I don't have gas!"
there is a video in my other post
http://forums.corvetteforum.com/c3-t...nts-video.html
I was going to say "I promise I don't have gas!"
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Melting Slicks
Joined: Jul 2010
Posts: 2,503
Likes: 33
From: McGrady NC
St. Jude Donor '15-'16
I saw that video earlier. I still think your outer u-joint or the outer retainer is bent, broken, or not seated correctly. Disassembly required to inspect and repair. I'm sure that causes a mean vibration at speed. Not to mention the stress is puts on the trailing arm bearings.
Thread Starter
Pro
Joined: May 2001
Posts: 571
Likes: 5
From: usa
Casey,
what are you calling the outer retainer, is this the hub and outer u-joint asemmblely,
if so, thet were not seated properly, I have cleaned and reassembled driver side. and the shake/jump/thump is still there with just the one side together.
what are you calling the outer retainer, is this the hub and outer u-joint asemmblely,
if so, thet were not seated properly, I have cleaned and reassembled driver side. and the shake/jump/thump is still there with just the one side together.