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#3209703 - 12/07/13 05:30 PM Re: GL5 with friction modifiers [Re: MolaKule]
dailydriver Offline


Registered: 03/14/06
Posts: 7065
Loc: Bucks County, Pa.
Originally Posted By: MolaKule
Originally Posted By: redbone3
I found this on the Torsen website:

Torsen for GM vehicles:

Is it true that the Torsen unit in the production Camaro needs the GM modifier added? Top of the Page

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.


Does the GM tech bulletin mention a part number such as GM #88900330 or some other "modifier?"

The description for this product says:

Quote:
The additive reduces friction between your limited slip or positraction differential friction plates to eliminate the annoying chatter that is common with these types of units. This Chevrolet Performance limited slip lubricant additive not only quiets your rear-end, but it can also aid in your differential's ability to apply and release the clutch smoothly, creating a more pleasant and predictable power delivery.


There are no clutches in the Torsen.


My guess is that it slightly reduced the case to outer worm gear friction, just enough to eliminate the noises.

I remember this TSB, even though it did NOT affect me since I had already changed out the T-2 for an Eaton carbon clutch pack Posi (about a year after I bought the car), which DOES need some FM to not 'rusty screw', or chatter around slow, parking lot speed turns, or no torque applied, coasting turns. wink
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#3210854 - 12/08/13 09:43 PM Re: GL5 with friction modifiers [Re: dailydriver]
MolaKule Offline


Registered: 06/05/02
Posts: 14642
Loc: Midwest
Originally Posted By: dailydriver
Originally Posted By: MolaKule
Originally Posted By: redbone3
I found this on the Torsen website:

Torsen for GM vehicles:

Is it true that the Torsen unit in the production Camaro needs the GM modifier added? Top of the Page

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.


Does the GM tech bulletin mention a part number such as GM #88900330 or some other "modifier?"

The description for this product says:

Quote:
The additive reduces friction between your limited slip or positraction differential friction plates to eliminate the annoying chatter that is common with these types of units. This Chevrolet Performance limited slip lubricant additive not only quiets your rear-end, but it can also aid in your differential's ability to apply and release the clutch smoothly, creating a more pleasant and predictable power delivery.


There are no clutches in the Torsen.


My guess is that it slightly reduced the case to outer worm gear friction, just enough to eliminate the noises.

I remember this TSB, even though it did NOT affect me since I had already changed out the T-2 for an Eaton carbon clutch pack Posi (about a year after I bought the car), which DOES need some FM to not 'rusty screw', or chatter around slow, parking lot speed turns, or no torque applied, coasting turns. wink


You could be right. Maybe I am trying to over analyze this thing, something I have never done in my life, of course. grin

But if you look at the simulation, torque forces are being transferred purely across the gearing, so the only thing left in my view would be the bearings in the gear carriers. AKA, reactive forces causing wobble in the bearings that could be dampened out by the polymers in FM.
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#3212295 - 12/10/13 12:21 PM Re: GL5 with friction modifiers [Re: Whitewolf]
brandini Offline


Registered: 10/08/09
Posts: 998
Loc: Richmond, VA
Originally Posted By: Whitewolf
It depends on the advised change interval but it is well proven that FMs reduce the life of a gear oil when compared to a non FM version of the same formulation.

Link to data?
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#3212356 - 12/10/13 01:33 PM Re: GL5 with friction modifiers [Re: brandini]
Whitewolf Offline


Registered: 10/05/06
Posts: 1899
Loc: MI, USA
There is no link. I would have to post an example of what I can show but it is not a point of debate it is a very well known fact throughout the lubricant industry.
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#3212556 - 12/10/13 04:04 PM Re: GL5 with friction modifiers [Re: Whitewolf]
72te27 Offline


Registered: 07/21/10
Posts: 87
Loc: Kentucky
Originally Posted By: Whitewolf
We have been using Torsen diffs for years...

Who is "we"?
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#3214264 - 12/12/13 08:51 AM Re: GL5 with friction modifiers [Re: 72te27]
Whitewolf Offline


Registered: 10/05/06
Posts: 1899
Loc: MI, USA
Quite a number of manufacturers either as a conventional diff or a center diff for 4WD. In fact a Torsen diff equipped F1 car won a GP at the Hungaroring some years ago.


Edited by Whitewolf (12/12/13 08:51 AM)
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#3215934 - 12/13/13 08:56 PM Re: GL5 with friction modifiers [Re: 72te27]
bruce381 Offline


Registered: 06/23/05
Posts: 3324
Loc: Millbrae, CA
whitewolf give up go back to the shadows LOL

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#3216172 - 12/14/13 04:37 AM Re: GL5 with friction modifiers [Re: redbone3]
INDYMAC Offline


Registered: 07/15/06
Posts: 2330
Loc: Magnolia, TX
Originally Posted By: redbone3
I recently put Peak Limited Slip Synthetic 75-90 GL5 gear oil in my '95 Miata (Thorsen) axle. I understand the Thorsen axle doesn't require the LS oil. My thought was any rear axle is going to have very similar requirements for lubrication (still has a ring and pinion gear for example) so the LS type lube would be fine. Am I missing something?


I think LE1605 DUOLEC would work very well in your Miata Torsen LSD.
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