Trac loc diff oil -
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post #1 of 4 Old 04-02-2013, 05:52 PM Thread Starter
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1991 FSJ Wagoneer 
Join Date: Feb 2013
Location: Closter
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Trac loc diff oil

I have a 1991 Waggy with towing package and trac loc rear differential. Hanes says to have 90w140 great oil and friction modifier.

Does anyone knows which modern oil should go in there?

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post #2 of 4 Old 04-02-2013, 06:49 PM
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1975 CJ6 
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Plain-old GL-5 hypoid gear oil, typically 85W90 weight. Oddly, Haynes calls for 140 wt (typically 85W140 today). I'd trust the owner's manual for the weight, if you have one.

But I likely wouldn't even look it up - I'd put in 85W90.

You need the friction modifier. It comes in a tube that you squeeze in before you add the oil. Some brands of oil say "limited slip compatible" and you may be ok with that. But they often chatter without adding some modifier. Try it without if you want. If it chatters, add some modifier.

1) '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps. 2) '82 J20 360/T18/NP208/3.73, KOs, 7600 GVWR 3) '75 CJ-6, 304/T15, PS, BFG KM2s, soft top 4) '95 VW Golf Sport 2000cc 2D
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post #3 of 4 Old 04-02-2013, 07:02 PM Thread Starter
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The manual says 75w90 for regular and 85w140 for towing package.
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post #4 of 4 Old 04-03-2013, 01:16 PM
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If you want to call it "modern", use a synthetic. Most are slippery enough not to need the friction modifier.
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