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Old 08-03-2009, 10:09 PM   #1
ProdigyScooby
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Default Tranny same as Rear Diff Fluid??

Hey guys, this is gonna be a reaaaaaaaaaaally stupid question, but im very serious and need some help...

Im about to do my tranny fluid change, and I decided to go with Redline Shockproof tranny fluid. I just wanna know... the 75W 95 fluid im using for the tranny fluid I can put in the rear differential fluid as well, correct? And cause no harm? Its pretty much the same thing, correct?

Sorry for such a stupid question... I just need some help, I figure I would ask instead of ****ing something up

Thanks in advance
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Last edited by ProdigyScooby; 08-03-2009 at 10:17 PM.
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Old 08-03-2009, 10:48 PM   #2
yo vanilla
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you want a fluid for the rear diff with an additive, a "friction modifier" for the LSD. i don't see that shockproof meets the needs according to redline's website. if you want redline, you want 75w90 for the diff

http://www.redlineoil.com/products_g...bCategoryID=16
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Old 08-04-2009, 12:01 PM   #3
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thank you for that info

so what would other recommend, i heard Motul thrown around a few times?

and what specific gear oil do i need for the tranny and for the rear diff? are they be used as the same fluid regardless of what brand i use?
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Old 08-04-2009, 01:34 PM   #4
z&cobb
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If it is Redline, their recommendation for my car, is 75w90NS in the transmission and 75w90 in the rear differential. It has worked for me and kept the "glass" gears from shattering.

I have been told that Motul is good. I know of only one problem with a Legacy GT with Motul in the transmission, but I refain from placing blame on the basis of a single instance. Some could say something like that for Redline or Uncle Scotty's cocktail. You pays your money; you takes your chances.
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Old 08-04-2009, 02:45 PM   #5
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Quote:
Originally Posted by yo vanilla View Post
you want a fluid for the rear diff with an additive, a "friction modifier" for the LSD. i don't see that shockproof meets the needs according to redline's website. if you want redline, you want 75w90 for the diff

http://www.redlineoil.com/products_g...bCategoryID=16
WRONG!

Read your owners manual. The WRX rear diff does not need friction modifiers it is not a clutch type rear diff, its a viscous coupling.

75w90 is what goes in the WRX rear diff.

The only WRX that needs different rear diff oil are certain year STi vehicles that need Subaru LSD Oil.

sheesh.
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Old 08-05-2009, 07:50 PM   #6
yo vanilla
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I do read the owners manual. (Ironically I work for an OEM vehicle manufacturer and I create tech manuals). I read it cover to cover when I bought the car (really). My WRX's owner's manual, page 11-23 only says to use a GL-5 oil and not to mix different brands together.

That doesn't matter since I mistakenly thought the OP had an STI. But since you were such a polite contributor, perhaps you could be so generous to tell everyone why you first discredited me without offering the benefit of the doubt, THEN recommended not only the same oil as I but the one that happens to contain the friction modifier package anyway?

Everyone's a keyboard engineer. Or maybe they call them gurus now? SHEESH
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Old 08-06-2009, 09:53 AM   #7
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for wrx...
put motul 300 straight front and rear and forget about it....
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Old 08-06-2009, 10:44 AM   #8
jay25RS
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The rear differential at least on my 2006 WRX is a viscous type sealed unit. This utilizes a viscous silicone fluid which is sealed from the rest of the gear oil in the differential...

That being said, stick with GL-5 rated fluid and fill up the transmission/front diff and rear diff with it...

I use ENEOS and it has made shifting feel butter smooth on my 5 spd and absolutely awesome on my buddy's '07 STI.

*The only STI/ STi's that should need the friction additives are the ones with 'plate-type' LSD's.
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Old 08-08-2009, 07:06 AM   #9
badhogan
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Default fluid

You could also use the "real deal" Extra S from Subaru. I have some in the bulk container available. Sorry for the shameless plug.
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Old 08-09-2009, 07:58 PM   #10
ProdigyScooby
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Quote:
Originally Posted by bzbuzz View Post
for wrx...
put motul 300 straight front and rear and forget about it....
so motul 300 75w90 in the front and rear? and we are good to go???

i notice you have an 06 wrx too, and i dont have an STI guys, i wanna use the stuff thats made for my specific car...
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Old 08-10-2009, 09:43 AM   #11
jay25RS
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Quote:
Originally Posted by ProdigyScooby View Post
so motul 300 75w90 in the front and rear? and we are good to go???

i notice you have an 06 wrx too, and i dont have an STI guys, i wanna use the stuff thats made for my specific car...
Umm... yea, it's been said. 75w/90 GL-5 for a 2006 WRX.
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