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lube for Eaton/Detroit Tru-Trac #4621608
01/02/18 11:50 AM
01/02/18 11:50 AM
Joined: May 2004
Posts: 49
Great Bend, KS
code5coupe Offline OP
code5coupe  Offline OP

Joined: May 2004
Posts: 49
Great Bend, KS
Summit, from whom I bought the unit, says use conventional gear lube. Why not full synthetic? Anyone had bad results using synthetic?


1996 Corvette LT4
2012 Grand Cherokee SRT
Re: lube for Eaton/Detroit Tru-Trac [Re: code5coupe] #4621640
01/02/18 12:17 PM
01/02/18 12:17 PM
Joined: May 2004
Posts: 49
Great Bend, KS
code5coupe Offline OP
code5coupe  Offline OP

Joined: May 2004
Posts: 49
Great Bend, KS
Sorry, guys, I forgot I'd already posted this some time ago....


1996 Corvette LT4
2012 Grand Cherokee SRT
Re: lube for Eaton/Detroit Tru-Trac [Re: code5coupe] #4621643
01/02/18 12:19 PM
01/02/18 12:19 PM
Joined: Jan 2015
Posts: 110
Charles City, Iowa
rideahorse Offline
rideahorse  Offline

Joined: Jan 2015
Posts: 110
Charles City, Iowa
bop Because aside from what all the coolade drinkers say. There are places that conventional oil is better than syn oils.

Re: lube for Eaton/Detroit Tru-Trac [Re: rideahorse] #4621656
01/02/18 12:25 PM
01/02/18 12:25 PM
Joined: May 2004
Posts: 49
Great Bend, KS
code5coupe Offline OP
code5coupe  Offline OP

Joined: May 2004
Posts: 49
Great Bend, KS
We've established that. The question is "why"?

Last edited by code5coupe; 01/02/18 12:26 PM.

1996 Corvette LT4
2012 Grand Cherokee SRT
Re: lube for Eaton/Detroit Tru-Trac [Re: code5coupe] #4621700
01/02/18 01:12 PM
01/02/18 01:12 PM
Joined: Jan 2015
Posts: 110
Charles City, Iowa
rideahorse Offline
rideahorse  Offline

Joined: Jan 2015
Posts: 110
Charles City, Iowa
Because conventional allows the true-track to function the way it was designed. Syn has too much drain off. It does not have the right friction properties for it to work right.

Re: lube for Eaton/Detroit Tru-Trac [Re: code5coupe] #4621865
01/02/18 04:05 PM
01/02/18 04:05 PM
Joined: May 2012
Posts: 2,457
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline

Joined: May 2012
Posts: 2,457
The land of USA-made Subies!
And where's your DATA to support that, rideahorse?

Use what the manufacturer recommends here... which is a good mineral oil, without friction modifiers.

Detroit Truetrac
Q: What kind of oil should I use? Can I use synthetic? Do I need friction additive/modifier?
A: A quality petroleum/mineral based oil works best in the Truetrac units. We do not recommend synthetic oil. Friction additive/modifier is not required.

Re: lube for Eaton/Detroit Tru-Trac [Re: code5coupe] #4621891
01/02/18 04:31 PM
01/02/18 04:31 PM
Joined: Apr 2012
Posts: 1,462
East Mountains, NM
4wheeldog Offline
4wheeldog  Offline

Joined: Apr 2012
Posts: 1,462
East Mountains, NM
Huh. I have had a Truetrac in my 4runner for about 100k miles.
I used conventional for breakin, and boy did it get hot!
After 50 miles or so, I put in Redline, (Which immediately ran much cooler) and that is what I have used ever since.
No mention at the time of installation that synthetic was not recommended.
It works great, but maybe it would work even better with mineral?
Who knew?

Re: lube for Eaton/Detroit Tru-Trac [Re: code5coupe] #4664540
02/13/18 08:39 AM
02/13/18 08:39 AM
Joined: May 2004
Posts: 49
Great Bend, KS
code5coupe Offline OP
code5coupe  Offline OP

Joined: May 2004
Posts: 49
Great Bend, KS
The entire rear end depends on the diff lube; gears, limited-slip, wheel/axle bearings, pinion bearings. Do I use what's best for one component (LSD) at the expense of the rest of the components?
As I understand it, the synthetic lube does not hurt the Tru-Track, it just doesn't allow it to lock up as readily....which should, in theory anyway, make it last longer.


1996 Corvette LT4
2012 Grand Cherokee SRT
Re: lube for Eaton/Detroit Tru-Trac [Re: code5coupe] #4664906
02/13/18 04:25 PM
02/13/18 04:25 PM
Joined: Oct 2010
Posts: 796
GA
JZiggy Offline
JZiggy  Offline

Joined: Oct 2010
Posts: 796
GA
I have a TrueTrac and I use the Redline NS gear oil. So it is synthetic but does not have the "limited slip" friction modifiers.

I guess if the oil is too "slippery" the torque bias of the unit is reduced.

In the past I have used various other oils with friction modifier and the unit still seemed to work properly. I don't think a friction modified oil would hurt the TrueTrac... I don't see how that could be possible.


Basic,, Simple,
Re: lube for Eaton/Detroit Tru-Trac [Re: code5coupe] #4669783
02/18/18 02:09 PM
02/18/18 02:09 PM
Joined: Oct 2010
Posts: 24
Indianapolis, In.
Darren_L Offline
Darren_L  Offline

Joined: Oct 2010
Posts: 24
Indianapolis, In.
I have been beating on my 12 bolt TrueTrac for 7 years running nothing but Red Line Heavy Shockproof gear lube with zero issues. Power is provided by a 700hp 496 with a Tremec 6 speed and with a set of sticky M/T DOT cheater slicks, it has easily handled all the abuse I've thrown at it. Differential runs cool, quiet, smooth and both rear tires have always locked when tires spin.


71 Chevelle 496BBC Brad Penn 10w30
04 Silverado Valvoline FS 5w30
96 Impala SS Valvoline FS 10w30
99 Civic MaxLife 5w30
96 Ranger MaxLife 5w30

Re: lube for Eaton/Detroit Tru-Trac [Re: code5coupe] #4670850
02/19/18 01:21 PM
02/19/18 01:21 PM
Joined: Sep 2015
Posts: 6,175
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline

Joined: Sep 2015
Posts: 6,175
Kalifornia Kollective
There you go - Shock Proof IS #1 for keeping them alive laugh


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
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