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Old 06-25-2001, 10:40 AM   #1
omahasubaru
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2002 Legacy

Question Replacing Tranny & diff fluids instructions

Well I'm at 30k now and it's time to upgrade to some better Tranny and diff fluid.

I'm looking to get redline MTL for the tranny and MT 70 90 for the diffs.

The rear diff looks rather easy to change out, but the transmission dosen't. Well we have no Chilton Manuals for our cars and our maintence and owner's manuals only cover the amount of fluid needed, not how to change it.

I doubt a dealership will let you bring in your own fluids to do this and I don't want to pay their prices. Could go to a tunning shop, but would rather experience and do it myself as then I know it's done right and no hot rodding occurs in my car.

Let me if you have done it your self or if there is a 'write up' somewhere of how to do it.

Thanks in advance,

Jon
http://www.nebraska.mwsoc.org
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Last edited by omahasubaru; 06-25-2001 at 10:42 AM.
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Old 06-25-2001, 11:41 AM   #2
rs01
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I just finished doing it myself (at only 6k!). After you lift the car, you'll see only a drain plug for the front tranny/diff housing, unlike the rear diff which also has a fill plug.

After draining the fluid and reinserting the drain plug, I lowered the car, popped open the hood, and put new fluid in through the tranny's dip stick opening, which you can access with a long funnel at the left rear of the engine compartment.

Make sure you have the right funnel or tube to reach the dipstick opening. Hope this helps.

Alex
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Old 06-25-2001, 11:45 AM   #3
JGard
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heh, oddly enough, I've been adviced my both my friend's who are kinda mechanics), and by my mechanic to not replace my tranny gear oil.

as for the diffs, I need to do those, too
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Old 06-25-2001, 11:53 AM   #4
omahasubaru
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Default Why not?

Why did they say not too? Redline's MTL has a friction additive designed for sychronized transmissions so it would be perfect for our cars. It will be much better protection all around compared to the stock fluid too.
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Old 06-25-2001, 12:24 PM   #5
JGard
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i've been told that once replacing the gear oil, that none of the seals will sit properly anymore...this is what my friends told me

my mechanic said that my tranny would start making like clicking or grinding noises (they don't think they can be technical with me).

so, whatever...
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Old 06-25-2001, 12:41 PM   #6
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Some mechanics are wary about synthetic lubes like the Redline products. A synthetic lube is much less viscous than a convetional oil. It can cause seals and gaskets to start leaking just because it is thinner than the regular oil, even the same visoucity ratings. The synthetic lubes are designed to act like a thicker oil, due to the molecular structure. The chains in the synthetic lube are different than the dyno oil.

As far as clanking and grinding, that sounds like they have expereince with improper selection of synthetic oil grades.

We are using MT-90 in our trannies and love it. Shifts are smoother.

For the rear diff, Redline 75-90NS.

There is a great tech article at www.cobbtuning.com
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Old 06-25-2001, 01:31 PM   #7
8Complex

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I'm using Redline 75W90NS in my trans and IMHO, it's too thin. I can't change gears nearly as fast I could before. Granted I went turbo, so slowing down between shifts is good since I want to keep this stock trans, but NA folks should be aware of that.
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Old 06-25-2001, 03:19 PM   #8
omahasubaru
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Default MTL?

Has anyone used the MTL-90 like mentioned on Cobb's tech article. I see lots of people use the 70-90NS for their diffs, but why not use an MTL line for the 'L' additive for synchros?

So does anyone have this in their car?
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