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Diff and gear box oil change

PostPosted: Tue Dec 13, 2016 12:24 pm
by phatmonk
Hi!

Going to change the diff and gear box oil soon. Poking around, I've found these pretty useful:
http://legacygt.com/forums/showthread.p ... 94834.html
http://www.subarulegacy.com/tech-articl ... ssion.html
viewtopic.php?f=16&t=28295

Condensing what I've pulled together, from the above and other places:
* No focus on brands. 5 liters of full synth 75W90 oil is right for the 6MT diff and gear box.
* Have a T70 bit handy
* It doesn't really matter about the torquing the plugs. If it was tight, put it back on tight
* Undo the top plug on the rear diff first
* 1/2 drive will undo the rear diff sump plugs

I'd like to ask if the GTB has the same "issue" with the exhaust in the way of the top plug?

It all seems easy...

Cheers!

Re: Diff and gear box oil change

PostPosted: Tue Dec 13, 2016 1:11 pm
by BillyCorgi
Beware!

viewtopic.php?f=16&t=30518&hilit=+well+oil+beef+hooked

Some 6MT use a HEX Plug on the Front Diff while later ones use the T70.
Do not drain the Rear Diff until you have the Fill plug loose.
Nulon G70 additive improves the quality of the gear change feel, especially if you are running a Short Shifter.

Re: Diff and gear box oil change

PostPosted: Tue Dec 13, 2016 2:44 pm
by phatmonk

That's a bit epic. Did I miss it in the thread? What fits the hex plug? Found your Facebook page earlier today, I'll be hitting you up for a power steering pump in the future.

Re: Diff and gear box oil change

PostPosted: Tue Dec 13, 2016 3:21 pm
by jarrenowen
buy the company23 13mm square drive tool, the 1/2 tends to slip and strip them out, especially how tight they are.

Re: Diff and gear box oil change

PostPosted: Tue Dec 13, 2016 7:56 pm
by phatmonk
jarrenowen wrote:buy the company23 13mm square drive tool, the 1/2 tends to slip and strip them out, especially how tight they are.


$USD14.95 is fine for the bit. The $35USD+ for shipping is a killer. Around $AU65 for slow postage is steep especially for a bit I'd use maybe three or four times.

... time to find something locally!

Re: Diff and gear box oil change

PostPosted: Wed Dec 14, 2016 6:20 pm
by jarrenowen
like $20 through carmodsaustralia... Can get the company t70 torx bit from them while you're at it too!

Re: Diff and gear box oil change

PostPosted: Thu Dec 15, 2016 8:33 am
by phatmonk
jarrenowen wrote:like $20 through carmodsaustralia... Can get the company t70 torx bit from them while you're at it too!

Awesome! Both bits delivered for $60 :)

Re: Diff and gear box oil change

PostPosted: Sat Dec 31, 2016 7:02 pm
by phatmonk
Turns out the sump bolts on the diff didn't require a 13mm square drive socket. Can't recall what the imperial socket was that fitted it perfectly, but it was just a regular old bolt.

Both gearbox (T70) and filler bolts were tight. After a good shocking they all came out with no fuss and filled with Penrite Pro Gear 75W90 all round.

Added a tube of Nulon G70 to the gearbox. It could just be new oil, or a combination of new oil and additive but it shifts awesome.

Thanks for the help!