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Unread 04-02-2013, 04:52 PM   #1
Rosental1
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1991 FSJ Wagoneer 
 
Join Date: Feb 2013
Location: Closter, NJ
Posts: 64
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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Unread 04-02-2013, 05:49 PM   #2
timgr
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1975 CJ6 
 
Join Date: Dec 2012
Location: Medford, MA
Posts: 463
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.
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Unread 04-02-2013, 06:02 PM   #3
Rosental1
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1991 FSJ Wagoneer 
 
Join Date: Feb 2013
Location: Closter, NJ
Posts: 64
The manual says 75w90 for regular and 85w140 for towing package.
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Unread 04-03-2013, 12:16 PM   #4
CSP
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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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