Ok all, does anyone know for fact what the the equivalent gear oil is for the 9? I have been wanting to try to upgrade the gear oils but the manual says 75-90 can be used in the gearbox, but "Mitsubishi LSD Oil" or equivalent in the front and rear difs. So what is the Equivalent? I have narrowed down my choices on personal preferecne to Royal Purple or Redline, both have the hypoid gear oil additives for limited slip already mixed in.....So whats the Equivalent.....Thanks For your time all.......

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I wouldnt put anything other than stock fluids in the transfer case and rear diff.

But...search button is your friend bud.
There has been numerous threads about this.

 

Your right in the transfer case I am and will when needed use the Mits fluid, but I am talking about the front and rear axles not the transfer case.

 

You might wanna read your question again.
I see nothing that says anything about axles.

I see LSD and front & rear diffs.

 

i took my car to southcoast mitsu and the guy recommended using a thicker redline fluid in the t-case so i did. seems fine to me

 

any reasons for "upgrading" the oils though? i mean, most likely, you won't even notice the difference, and the factory oils make the parts last a very long time, so why would you swap? i'm just curious. if you're going to track the car at autox or road course or rally, that might make sense then.