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Torsen gear oil #4802179
07/01/18 10:50 AM
07/01/18 10:50 AM
Joined: Aug 2009
Posts: 14
FL USA
JimMueller Offline OP
JimMueller  Offline OP
Joined: Aug 2009
Posts: 14
FL USA
I'm looking to install a Eaton/Detroit TrueTrace Torsen differential in the near future. The owners manual states:

---
Detroit Truetrac®
High quality mineral gear lubes are required for use in
Detroit Truetrac differentials. Regardless of the lube
type, always use a GL5 rated lube with the least
amount of friction modifier. Mineral lubes lacking
friction modifiers (limited-slip additives) were
historically recommended for all Truetrac applications
because friction modifiers can slightly reduce the bias
ratio (limited-slip aggressiveness) of Truetrac
differentials. However, to address the continually
increasing power outputs of modern powertrains, many
vehicle manufacturers have switched to synthetic
lubricants as a counter measure for increased axle
temperatures and prolonged service intervals. In
general, consult the vehicle owner's manual for the
manufacturer's recommendations for lubrication type,
weight and fill volume. This will ensure lube
compatibility with the seal materials and bearings used
in the axle. Eaton Performance technical support is
available for any concerns in lube selection.
---

The factory fill recommendation for the OEM rear-end is a synthetic 75W90, but the factory differential was not a Torsen design. I'll be using either the OEM axles, or aftermarket replacement axles. Some are saying "140 is too heavy for a Torsen. No manufacturer will recommend an oil that heavy, it will change the friction levels the diff relies upon to function to its fullest", while others are saying the 140 will reduce noise. Application will be daily driver that sees some autocross and HPDE sessions (20 minute sessions of limited passing).

I've found the following gear oils without friction modifiers, should I consider any of these or look elsewhere?


Re: Torsen gear oil [Re: JimMueller] #4802206
07/01/18 11:08 AM
07/01/18 11:08 AM
Joined: Sep 2015
Posts: 2,263
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,263
Malaysia
You may consider Torco 85W140 of 368 cSt KV40*C.

Re: Torsen gear oil [Re: JimMueller] #4802241
07/01/18 11:33 AM
07/01/18 11:33 AM
Joined: Aug 2009
Posts: 14
FL USA
JimMueller Offline OP
JimMueller  Offline OP
Joined: Aug 2009
Posts: 14
FL USA
Stumbled across this from another Torsen manufacturer. It sounds like the 90W offers slightly more friction than the 140W.

https://torsen.com/lubricant-part-2/

"For our own R&D work, we use Chevron Supreme LS 80W90 as a “house” oil. That leads me to another point. While a differential like the Torsen Type-2 is happy in whatever good quality oil that you may choose, oil weight (viscosity) comes into play with regards to performance. As I stated earlier, Torsen works by generating internal friction. So, logically, if different oil blends have different frictional properties, that mean they have different influences on the differential’s behavior.

Essentially, the heavier, thicker, or more viscous that the oil is, the better it lubricates (generally). It leaves a heavier film adhered to the surfaces being lubricated. This reduces friction. But, that means that a differential operating in 75W-140 oil will have fractionally less locking effect than the same unit operating in 75W-90. This difference is not night and day – the changes are subtle. But if you’re fine-tuning a race car, it does offer one more knob that you can turn. By the same token, lubricant formulation and additives used have a similar bearing on the matter."

Here's an updated chart.

Last edited by JimMueller; 07/01/18 11:34 AM.
Re: Torsen gear oil [Re: JimMueller] #4802260
07/01/18 11:54 AM
07/01/18 11:54 AM
Joined: Jul 2016
Posts: 1,483
Jacksonville, FL
FlyNavyP3 Offline
FlyNavyP3  Offline
Joined: Jul 2016
Posts: 1,483
Jacksonville, FL
I'm running plain old Super Tech 80w90 in my TrueTrac axle and have no complaints 15,000 miles in. Tons of bite.

If I was going to use a Synthetic gear lubricant in it I was planning on using Redline NS which is on your list, pick the viscosity that suits the manufacturer recommendation and use the Redline if you want a Synthetic.


Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander
Re: Torsen gear oil [Re: JimMueller] #4802292
07/01/18 12:17 PM
07/01/18 12:17 PM
Joined: Aug 2009
Posts: 14
FL USA
JimMueller Offline OP
JimMueller  Offline OP
Joined: Aug 2009
Posts: 14
FL USA
If I'm understanding correctly, it seems to be a tradeoff between the additional load protection of the 140 vs. the slightly better friction allowed by the 90. Since I plan to use an OEM ring & pinion, and the OEM lubrication is recommended to use a 75W90, I guess I should stick with the xxW90.

Looking at the viscosity numbers for the xxW90 blends in the chart, which is better for my application?

Re: Torsen gear oil [Re: JimMueller] #4802298
07/01/18 12:21 PM
07/01/18 12:21 PM
Joined: Jun 2002
Posts: 19,246
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,246
Iowegia - USA
Have you considered trying something such as a 75W110?


Reading is fundamental; understanding is not a given ability.
Re: Torsen gear oil [Re: JimMueller] #4802313
07/01/18 12:38 PM
07/01/18 12:38 PM
Joined: Feb 2014
Posts: 13
CenCoast California
Hib_Halverson Offline
Hib_Halverson  Offline
Joined: Feb 2014
Posts: 13
CenCoast California
At one time, I owned an '01 Camaro, which came stock with a Torsen differential.

Except for the first 500 miles, I used Red Line Heavy Shockproof Gear OIl for the entire 15 years and 136,000 miles I owned the vehicle. I sold the car with the original rear axle in the the car. Periodically, I had lube samples analyzed and wear metals were always normal. Never had any noise from that axle and the Torsen diff always worked great existing turns.


H. Halverson
automotive technical writer
Re: Torsen gear oil [Re: JimMueller] #4802331
07/01/18 12:57 PM
07/01/18 12:57 PM
Joined: Aug 2009
Posts: 14
FL USA
JimMueller Offline OP
JimMueller  Offline OP
Joined: Aug 2009
Posts: 14
FL USA
I haven't found any 75W110 that explicitly states it doesn't contain friction modifiers, and I'd also prefer to see the tech specs on it for comparison.

Everything I've found on Redline's site regarding their three Shockproof varieties indicates it's extremely slippery, which means less friction for the differential, and also not to be used with coolers.

Re: Torsen gear oil [Re: JimMueller] #4802400
07/01/18 02:16 PM
07/01/18 02:16 PM
Joined: Jun 2005
Posts: 11,344
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,344
Santa Barbara, CA
My Mustang came from the factory with a Torsen T-2. Factory fill and recommended replacement is 75W140. I changed the factory fill out at 5K with Amsoil 75W140.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: Torsen gear oil [Re: JimMueller] #4802453
07/01/18 03:41 PM
07/01/18 03:41 PM
Joined: Jun 2002
Posts: 19,246
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,246
Iowegia - USA
Originally Posted By: JimMueller
I haven't found any 75W110 that explicitly states it doesn't contain friction modifiers, and I'd also prefer to see the tech specs on it for comparison.

Everything I've found on Redline's site regarding their three Shockproof varieties indicates it's extremely slippery, which means less friction for the differential, and also not to be used with coolers.


And Redline never defines "Slippery." Slip, Friction, Friction Coefficient, Traction Coefficien, etc., are scientifically definable terms in Tribobology, but "Slippery" is not.


Reading is fundamental; understanding is not a given ability.
Re: Torsen gear oil [Re: Hib_Halverson] #4803080
07/02/18 11:14 AM
07/02/18 11:14 AM
Joined: Dec 2013
Posts: 3,696
Massachusetts
turtlevette Offline
turtlevette  Offline
Joined: Dec 2013
Posts: 3,696
Massachusetts
Originally Posted By: Hib_Halverson
At one time, I owned an '01 Camaro, which came stock with a Torsen differential.

Except for the first 500 miles, I used Red Line Heavy Shockproof Gear OIl for the entire 15 years and 136,000 miles I owned the vehicle. I sold the car with the original rear axle in the the car. Periodically, I had lube samples analyzed and wear metals were always normal. Never had any noise from that axle and the Torsen diff always worked great existing turns.


I read on the corvette forum that you drained heavy shockproof from your 4 speed blazer and forgot and drove it for a good distance on the highway. Curious how that turned out. Did it live for a long time?


USA-1
Re: Torsen gear oil [Re: JimMueller] #4804191
07/03/18 04:36 PM
07/03/18 04:36 PM
Joined: Aug 2009
Posts: 14
FL USA
JimMueller Offline OP
JimMueller  Offline OP
Joined: Aug 2009
Posts: 14
FL USA
I guess I'll just go with the 75W-90NS, I know another fella that uses that fluid with the same car model, diff & rear end for open track events.

Re: Torsen gear oil [Re: JimMueller] #4807262
07/06/18 10:55 PM
07/06/18 10:55 PM
Joined: Jul 2013
Posts: 9
Missouri
Paulfix Offline
Paulfix  Offline
Joined: Jul 2013
Posts: 9
Missouri
Recently installed an Eaton Truetrac in my Silverado and filled with Motul 80w90. Truetrac works fantastic.

Re: Torsen gear oil [Re: JimMueller] #4813660
07/14/18 02:44 AM
07/14/18 02:44 AM
Joined: Feb 2004
Posts: 1,852
the antipodes
tdi-rick Offline
tdi-rick  Offline
Joined: Feb 2004
Posts: 1,852
the antipodes
I ran Motul Gear 300 (non LS) in an Ashcroft ATB (Ascroft Transmissions torque biasing centre, their version of a Torsen T2 or Quaife ATB) in a centre diff as it's an MTF/transaxle fluid.

It worked very well.

Last edited by tdi-rick; 07/14/18 02:45 AM.

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