[FC] click or clunk from differential?

[Ken Hand]

What I have experienced in the past is the same noise with new u-joints. What it turned out to be was the passenger side yoke moving around in the differential. If you look at a picture of the differential you will see that the short drive yoke is on the passenger side. Since there is more force on the shorter shaft it wears the carrier where it slides in and out. It doesn't wear from the sliding but rather the side forces put on it during normal driving. You can physically check this by just pushing up and down on both axles at the diff and see the difference in movement from side to side. After it wears some then you start to get this clicking and if you change the u-joint it will go away while the u-joint is new and sort of stiff but after that the noise comes right back.

There is a cure for that and a permanent fix. It isn't cheap and should be accomplished when you have the diff out for repair or rebuild. The ring gear side is the passenger side in the diff. and that is the piece that gets machined and repaired. I have done this to only a couple of diffs. but they were quiet after and I haven't heard back that there were any problems down the road. This fix works for the early cars also.


Ken Hand
248-613-8586
www.corvairmechanic.com



-----Original Message-----
From: Kevin Lloyd <pushrod2176 at yahoo.com>
To: corvanatics at corvair.org
Sent: Mon, Mar 29, 2010 11:10 pm
Subject: Re: [FC] click or clunk from differential?


Do you have contact info for the IL diff specialist? I am having the same 
ssues, more like a tick though and newer u-joints. Would be nice to have the 
nfo if needed. 

 have yet to look, mine may even be outboard say brakes or a bearing. I 
emember the previous owner talking about a tick in the rear and thats why he 
id u-joints and axle/bearings. It wasnt there initialy, but appeared and hasnt 
otten worse yet. 

hanks, Kevin
--- On Mon, 3/29/10, J R Read_HML <hmlinc at sbcglobal.net> wrote:

rom: J R Read_HML <hmlinc at sbcglobal.net>
ubject: Re: [FC] click or clunk from differential?
o: Wild8bill at aol.com, corvanatics at corvair.org
ate: Monday, March 29, 2010, 10:03 PM

 should have also said that you just might be due for a diff rebuild.  I 
now a guy who does that, but he's in Illinois.
ater, JR
----- Original Message ----- 
rom: <Wild8bill at aol.com>
o: <corvanatics at corvair.org>
ent: Monday, March 29, 2010 9:47 PM
ubject: [FC] click or clunk from differential?

I have a click or clunk sound that is correlated to the wheel rotating on
 the rear driver side. It is obvious when driving, but not too loud. This 
 is
 a  new thing that appeared in the last few weeks. I thought it might be 
 the
 wheel  bearing, but when I inspected it, the sound comes from the
 differential side of  the drive shaft, and only happens when turning the 
 axle
 forwards, not backwards.  Any advice?

 Bill
 Richmond, CA
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