Oil type for transmission and diff - JeepForum.com
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post #1 of 5 Old 06-14-2015, 08:15 PM Thread Starter
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1994 YJ Wrangler 
Join Date: Jun 2015
Location: Montreal
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Oil type for transmission and diff

Hi !

I just bouht a 1994 Jeep YJ, 6 cyl, with 5 speed manual transmission.
I' already changed the fuel filter,NGK spark plugs and spark plugs wire,K&N air filter, and an oïl change. The Jeep has 288 000 KM.

So now I want to change the transmission oil, the front and rear diff oil and the transfer case oil.

I was wondering i I can use the Redline MT-90, which is API GL-4 for my 2 diff ?

And can I use Castrol Hypoy C for the transmission ?

Thanks for your support.

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post #2 of 5 Old 06-16-2015, 11:41 AM Thread Starter
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No one can answer ???
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post #3 of 5 Old 06-16-2015, 11:52 AM
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post #4 of 5 Old 06-16-2015, 11:57 AM
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Use regular gear oil for your diff, 75-90w works for the front and same for the rear and if you have a LS in rear use a little fiction modifier. If you tow or what ever you can get the 90w140 from rear... I never bother with it as what can you tow with a jeep wrangler that will be a stress...

Use walmart brand 10w30 in the trans.. Just the regular stuff nothing special..

ATF trans fluid for the Transfer case...
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post #5 of 5 Old 06-16-2015, 11:58 AM
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1993 YJ Wrangler 
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The FAQ is always a good place to start for these kinds of questions.

Basically any 75w90 gear oil in the diffs, any 10w30 motor oil in the transmission. Use synthetic if you're not good about changing it as often as you should.

~/Garth - 1993 Wrangler S 2.5
{ }|||||||{ } "MukYJ"

Originally Posted by Anticanman View Post
He's right, as soon as you remove the trackbar the fuel rail will arc on the battery, killing you and all the kittens in a ten mile radius.
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