Differential/Gear Fluid Type
#11
04-25-2013, 08:22 PM
That's what I was wondering. Mine's as early it gets for the fourth gens, I used synthetic with no additive either. Again, may be I got lucky, but that one instance revokes a "can't be used".
#12
04-25-2013, 10:44 PM
Join Date: Oct 2007
Location: The 'Burbs of Chicago
Posts: 18,306
Here's the scoop on the additive:
"Is it true that the Torsen unit in the production Camaro needs the GM modifier added?
GM issued a technical bulletin adding modifier to the rear axle oil. This was done to quiet what we call a "Rusty Screw" noise that we heard in a very small percentage of vehicles. This does not happen in all cases, however to address owner's concerns we asked that the modifier be used in all instances to insure that the driver would not get this noise. When replacing the fluid it is at the owner's discretion whether or not to add the modifier. Elimination of the modifier does not affect durability of the differential."
Torsen General Frequently Asked Questions page
"Is it true that the Torsen unit in the production Camaro needs the GM modifier added?
GM issued a technical bulletin adding modifier to the rear axle oil. This was done to quiet what we call a "Rusty Screw" noise that we heard in a very small percentage of vehicles. This does not happen in all cases, however to address owner's concerns we asked that the modifier be used in all instances to insure that the driver would not get this noise. When replacing the fluid it is at the owner's discretion whether or not to add the modifier. Elimination of the modifier does not affect durability of the differential."
Torsen General Frequently Asked Questions page
#14
04-26-2013, 12:03 AM
When you say it slips -- how do you notice this slip -- what are the symptoms?
You're not the only one I've heard that happening to. I put Lucas synthetic in the rearend of my Vette, and that slips every once in a while. I'm going back to conventional oil in the rear. I don't see the need or want for a superior lubricant in a clutch type LSD anyway.
#15
04-26-2013, 12:05 AM
#16
04-26-2013, 12:48 AM
Join Date: Oct 2007
Location: The 'Burbs of Chicago
Posts: 18,306
It's hard to describe what I'm feeling when it happens, but when it does, it's generally after a turn. If I gas it hard, the rearend clunks, and I can feel it through the whole car. But right before it clunks, I get a split second sensation that something in back isn't grabbing. This isn't a differential play type of clunk either, it happens while under a load. Again, it's hard to describe. This can happen once a day, or once a week, and it doesn't seem to matter whether it's after a cold start or after a long drive.
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