Rear Differential Gear Oil Change

1980-1986 Datsun 720 forums. All 720-specific topics and discussion can be found here.
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fastboatman29212
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Rear Differential Gear Oil Change

Postby fastboatman29212 » Thu Mar 10, 2011 9:21 pm

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PEZi
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Re: Rear Differential Gear Oil Change

Postby PEZi » Thu Mar 10, 2011 9:27 pm

More awesomeness man!

I'm finding it hilarious that most of the stuff you're doing I'm doing at the same time... lol

Just got all my fluids for 2011 in

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fastboatman29212
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Re: Rear Differential Gear Oil Change

Postby fastboatman29212 » Fri Mar 11, 2011 8:57 am

How do I get a cool NICOclub sticker for my windshield?

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PEZi
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Re: Rear Differential Gear Oil Change

Postby PEZi » Fri Mar 11, 2011 9:54 am

Send an email to [email protected] or send her a PM (nissangirl74). She handles all of that stuff.

drumaniac3000
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Re: Rear Differential Gear Oil Change

Postby drumaniac3000 » Wed Mar 23, 2011 9:02 pm

Upon reading a bit into the rating system for gear oils, I've noticed that GL-5 is incompatible with our manual transmissions and transfer cases. Unfortunately I have been unable to find any GL-4 specific oil locally, the only one close is this one:

http://www.oreillyauto.com/site/c/detai ... &ppt=C1985

Is it suitable for use in the trans and transfer case or do I need to drop $$ on a full syn like Amsoil?

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PEZi
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Re: Rear Differential Gear Oil Change

Postby PEZi » Wed Mar 23, 2011 9:23 pm

You don't need full syn, but you do need GL-4. I know that every auto store around here has GL-4 compatible gear oils from O' Reilly's, Mobil 1, Royal Purple etc. You probably won't find any cheap, or generic GL-4 (besides O' Reilly's brand) but it shouldn't be hard to find. The GL-4 fluids are needed in order to protect the brass synchros, plain and simple. I run AMSOIL because its a product I trust and its cheaper than MOTUL.

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fastboatman29212
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Re: Rear Differential Gear Oil Change

Postby fastboatman29212 » Thu Mar 24, 2011 4:09 am

The Coastal brand I got at Autozone says it's for GL-3, GL-4 and GL-5 applications and it was cheap, maybe $12. See the photo in my post.

drumaniac3000
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Re: Rear Differential Gear Oil Change

Postby drumaniac3000 » Thu Mar 24, 2011 4:27 pm

That's the one I went looking for and they didn't have any like that on the shelf. Going to check around town this afternoon and see what I can find.


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