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About halfway into 2000 Outback 4EAT swap, got a few questions.

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The front diff takes GL-5 gear oil, usually either 80W90 regular or 75W90 synthetic works. That one it is most likely the 22mm or so plug on the front diff with a copper sealing washer.

 

ATF in there won't hurt anything, but it is not best for that application, because it really needs the extreme pressure additives in the gear oil to adequately protect the gears. Otherwise they may wear prematurely.

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T70 probably you'll have to order, that's just a little too big for most places to carry it. Tool trucks would probably have it, given that Subaru and maybe other automakers are using them for drain plugs now.

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