Detroit TrueTrac lube recommendations -
  • 1 Post By 80cj
  • 1 Post By Chewtoy
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  • 2 Post By Axhammer
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post #1 of 7 Old 07-28-2021, 12:03 PM Thread Starter
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1983 CJ7 
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Detroit TrueTrac lube recommendations

Hey all,
I'm slowly making progress on getting my jeep back on the road.
Soon with be changing out the Diff fluids (D30 and AMC20) both with Detroit Truetrac installed.
I have been looking over the requirements... friction additives vs not... its all very confusing.
Can someone please clarify this and give best recommendations as to what I need to put in there. I have no clue what is is there now sadly.

I appreciate you all

I thank you and believe me my Jeep definatly thanks you cus otherwise I'd be turning a wrench with out a clue. :)
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post #2 of 7 Old 07-28-2021, 01:21 PM
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Did a quick web search and this is the first thing that popped up.
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post #3 of 7 Old 07-31-2021, 12:19 PM
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if these are real Trutracs, the 2 or 4 screw torsion style limited slip, then they don't need additives. Just put your normal gear oil in and go about your happy day :-)
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post #4 of 7 Old 08-01-2021, 08:49 PM
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Trutrac is a non-clutch type of limited slip. No additives required.

There's no harm in using additives in a diff that doesn't need them as well. Many synthetics do not require additives when used in clutch type limited slips and work in any diff.
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post #5 of 7 Old 08-01-2021, 11:23 PM
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Make sure you positivity identify it as a tru trac.

Paperwork will ruin any military force.
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post #6 of 7 Old 08-02-2021, 03:00 AM
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From Eatons website link posted above. In black and white.

A quality, petroleum-mineral based, GL5 rated 80w-90 gear oil should be used.

Synthetic oils are not recommended for Truetrac applications. While some customers have found that synthetic oils works well in this application, Eaton has not confirmed under test conditions that all synthetic oils are compatible with Detroit Truetrac applications.

Friction modifiers should not be used because they will decrease performance (reduce differential bias).
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post #7 of 7 Old 08-02-2021, 01:40 PM
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I have used synthetic GL5 with excellent results. Red Line 75/90NS (NS=non slip, no friction modifiers)

This is an interesting article from 2015 about the lube for truetrac.
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