Diff oil changes
Thread Starter
Melting Slicks
Joined: May 2002
Posts: 2,225
Likes: 44
From: Penticton B.C. Canada
Diff oil changes
Does anyone have any suggestions why I have to change my diff oil every 2 years? I put about 5 - 10 thousand miles on a year and every second year it seems, that growl comes back so I change the oil and add 1 1/2 or 2 GM additives.
Race Director
Joined: Apr 2015
Posts: 17,571
Likes: 3,460
From: Fresno California
Not normal. You probably have a mechanical issue with gear pattern or bearing wear...was your rear rebuilt or is it original, etc. Gear lube lasts for years and years and many miles. It really doesn't wear out. The reason to change it is usually contamination from moisture or hard parts failure, or because it got burnt/overheated (again, from parts/component failure). Hopefully others will chime in.
Thread Starter
Melting Slicks
Joined: May 2002
Posts: 2,225
Likes: 44
From: Penticton B.C. Canada
I should also mention that my side yokes seem to be working they're way inwards, there seems to be a lot of in out play, but kinda always has been with this unit. Probably only 25k miles on it. I should get this resolved, lots of touring planned for this summer. Does anyone have any thoughts?
Race Director
Joined: Feb 2007
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From: northern california
C2 of Year Finalist (track prepared) 2019
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Drifting
Joined: Mar 2006
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From: Delray Beach Florida
sorry dont mean to hyjack your thread - hoping to learn something about what needs to be done to repair I had the same noise on left turns only on my 67 - but it only happened 2 x's I am waiting for it to appear again--- its been 3 weeks still no growel -
csysman
csysman
Team Owner
Joined: Oct 2000
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From: Washington Michigan
The stub axles are ALWAYS forced inward against the cross pin, by design; the Corvette rear suspension geometry maintains inward pressure on both yokes at all times (unless the suspension is hanging free in full rebound, and that can only occur while driving the car if you "get air"). That's why the face of the inboard ends of the yokes are case-hardened - when that layer is gone, wear proceeds rapidly to the ring groove, and you lose the snap ring clips, then the groove too.
Thread Starter
Melting Slicks
Joined: May 2002
Posts: 2,225
Likes: 44
From: Penticton B.C. Canada
Thanks John. I understand that the wheel drive-shafts also act as a stressed member of the suspension. My biggest concern I think, besides the repeated need to change the diff oil, is that there seems to be way too much in/out movement on the side yokes with suspension hanging and getting worse. I see on another thread that tbarb concurs that when the clutches wear the yokes are allowed move further inwards. Could this be the situation? I do have infinite adjustments on the camber strut rods, after-market Spherical rod end assemblies, so I won't be able to tell by running out of adjustability..
Le Mans Master
Joined: Feb 2006
Posts: 5,073
Likes: 413
From: Maine
Thanks John. I understand that the wheel drive-shafts also act as a stressed member of the suspension. My biggest concern I think, besides the repeated need to change the diff oil, is that there seems to be way too much in/out movement on the side yokes with suspension hanging and getting worse. I see on another thread that tbarb concurs that when the clutches wear the yokes are allowed move further inwards. Could this be the situation? I do have infinite adjustments on the camber strut rods, after-market Spherical rod end assemblies, so I won't be able to tell by running out of adjustability..
Go Back Corvette Forum > C1 & C2 Corvettes, 1953 - 1967 > C1 & C2 Corvettes
Tell me it is a good thing to have gray metal fake in your rear end oil
It may jelp
Thread Starter
Melting Slicks
Joined: May 2002
Posts: 2,225
Likes: 44
From: Penticton B.C. Canada
Hi Jack, I did follow that thread. I saved the oils from the last change, there was not any sign of any flake at the time. I will be looking in the oil in this change for 'evidence'.