Which Transmission and Diff oil?

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Aug 4, 2022 | 08:19 AM

Simonp3

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From: Denmark

Which Transmission and Diff oil?

I want to change the transmission oil and differential oil on my 78 Pace Car.
Its a totally stock drive line.
I am having a hard time finding the original oil and additive, since i am located in Denmark - Europe.
i seek recommendations for a more "normal" oil that is available here in europe

Can you guys help me out?

I know that the transmission oil has to be a Dexron III compatible. I found this: Mobil ATF 320. It says it's recommended for GM DEXRON IIIG (https://www.mobil.com/da-dk/passenge...-mobil-atf-320) On danish, sorry!

The differential oil, i have understood has to be a 75w-90 oil and preferrebly this one: https://www.zip-corvette.com/gm-delc...lubricant.html with the Posi Trac Additive: https://www.ecklerscorvette.com/posi...-253364-1.html

Can i use something else? i have seen that Castrol makes a Limited Slip Diff Oil called: Castrol Transmax Limited slip 75w-90 which is now discontinued and is replaced by an oil with the same name, but it is now a 75w140 oil (https://landberg.dk/castrol-gearolie...RoCCgwQAvD_BwE)
Also on Danish, sorry

Can you guys recommend something else, which is more "universally" available?

I would like to find one that is good, cheap and known brand, so i can use the same, for years to come.

Aug 4, 2022 | 11:03 AM

~~ralphspears~~

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From: MA

Old vintage oil

Aug 4, 2022 | 11:04 AM

Simonp3

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From: Denmark

Quote:

Originally Posted by ralphspears

Old vintage oil

Exactly. That's my problem. Not available in this part of the world.

Aug 4, 2022 | 05:55 PM

calwldlife

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From: Southern Cal Ca

St. Jude Donor '22

Quote:

Originally Posted by Simonp3

Exactly. That's my problem. Not available in this part of the world.

Afraid that pure stuff isn't avail anywhere.
"DexMerc" is the only thing avail.
Brand would be your only choice to be made.

Aug 4, 2022 | 07:08 PM

69L88

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From: Apple Valley, MN

The additive you want is AC Delco 10-4003. Get 2 bottles.

Our resident differential expert is Gary Ramadei (gtr1999). He recommends Lucas 85w140 gear lube. It is what I run.

Aug 4, 2022 | 07:15 PM

HeadsU.P.

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From: Cool Northern Michigan

If the original GM lube made it 40+ yrs, w/o issues, why switch brands now is always my question.

Must be an Amazon near you, I would think.
They have the GM lube, large bottle
and posi modifier small bottle.