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Unread 04-25-2012, 11:23 AM   #1
90wranglerguy
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1989 YJ Wrangler 
 
Join Date: Apr 2012
Location: pensacola, fl
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90 wrangler gear oil?

Hey I just bought my first jeep, its a 90 wrangler sahara edition with the 6cyl and 5spd trans. I went to Oriellys to get gear oil and they gave my synthetic 75w90. Is the synthetic required or could i just get regular 75w90? Thanks.

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Unread 04-25-2012, 11:31 AM   #2
pete1991YJ
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1991 YJ Wrangler 
 
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For the trans, the factory recommended straight 30-weight motor oil. There was a dealer service bulletin update about it. Other than that, it doesn't seem to make much difference either way between synth and regular. It waas designed for regular but either way will work.

BTW welcome to JF, you've just found one of the best jeep sites anywhere!
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Unread 04-25-2012, 12:07 PM   #3
pasinbuy
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10w-30 motor oil
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Unread 04-25-2012, 12:15 PM   #4
bogleparsons
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75w90 is fine for the axles.
10w30 for the 5-speed transmission.
ATF for the transfer case.
5w or 10w-30 for the engine.
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Unread 04-25-2012, 02:44 PM   #5
90wranglerguy
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Thanks guys I appreciate the help. So the transfer case takes ATF and the trans uses 10w30?
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Unread 04-25-2012, 02:51 PM   #6
94chb
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Quote:
Originally Posted by 90wranglerguy View Post
Thanks guys I appreciate the help. So the transfer case takes ATF and the trans uses 10w30?
yes
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Unread 04-25-2012, 09:04 PM   #7
tomemt
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Just curious is this the same for all YJ's
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Unread 04-25-2012, 09:11 PM   #8
94chb
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Quote:
Originally Posted by tomemt View Post
Just curious is this the same for all YJ's
same for all EXCEPT if you have a automatic trans, then you put atf +4
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Unread 04-25-2012, 09:35 PM   #9
rodgers3
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1992 YJ Wrangler 
 
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dang i need to buy 10 w 30 for my transmison then :/ running synthetic in everything, i also just bought a 92 yj changed the engine oil today checking the axles tomorrow


side note....if its an auto you payed to much
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Unread 04-25-2012, 09:56 PM   #10
94chb
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1989 YJ Wrangler 
 
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Quote:
Originally Posted by rodgers3 View Post
dang i need to buy 10 w 30 for my transmison then :/ running synthetic in everything, i also just bought a 92 yj changed the engine oil today checking the axles tomorrow


side note....if its an auto you payed to much

my auto never gave me any problems, ive swapped to manual (ax15) and now the trans is out of the jeep for the 3rd time since the swap 1 year ago

make sure you also have atf in your transfer case.
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Unread 04-25-2012, 11:21 PM   #11
TMSquy
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1990 YJ Wrangler 
 
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If the ax5 or ax15 was built properly and you can customize the synchronizers so that they get more lubrication and less preload, you can in fact run 75-140 in it. its what ive been running since the day i learned to drive til now. Dana specifies 75-90 HP is recommended for front difs. rear diffs they want 80w-90. i run 75-140 in everything except the transfercase. i use atf+4 in the transfercase.
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