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GL4 Gear Lube
Posted by: corvairsince70 ()
Date: March 27, 2019 08:56PM

I know the subject of GL4 gear lube for Corvair manual transmissions has been discussed quite a bit. But after reading all that is said, I am not seeing a clear choice of lube to use. I see GL4 that is not for hypoid gears, I see GL4/5 that is not recommended. I see GL4 for hypoid gears but the weight is a little thick (80W-90).
Personally I would rather have conventional lube, not synthetic. But I am not finding anything but synthetic out there.
Is there a consensus on a good GL4 lube that is for hypoid gears and 75W-90?

Dennis
Nashville area
'68 Conv 140 PG
'66 Corsa Conv 180
'66 Corsa 140

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Re: GL4 Gear Lube
Posted by: joelsplace ()
Date: March 27, 2019 09:02PM

Not sure about a consensus but I've bought GL4 non-synthetic from Napa withing the last year I can't remember for 100% that it was 75W-90. I would much rather have synthetic. Hypoid gears love it and with the extended change times most people subject their transaxles to it seems even more important.

Joel
Northlake, TX
4 Ultravans, Lost count at 100 Corvairs...

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Re: GL4 Gear Lube
Posted by: Brizo ()
Date: March 27, 2019 09:14PM

The NAPA's around here only stock 80-90 GL4 which works fine, except some say shifting resistance is higher when cold. They will probably order the 75-90 for you. I've also heard that Amsoil has a 75-90 GL4. And then some guys say their 4 speeds shift fine with GL5, so...

Dan Brizendine,
'64 8door Greenbrier 140 PG. "In beautiful Wanamaker Indiana...with one stop light and 5 pizza shops"

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Re: GL4 Gear Lube
Posted by: Phil Dally ()
Date: March 28, 2019 04:48AM

In a detailed write up our petroleum industry expert Richard1 specifically recommends.

Amsoil Synthetic manual Transmission and Transaxle Gear Lube 75W-90 G-4.

We also have an Amsoil dealer here on Corvair Center...vairmech.


[www.amsoil.com]

[www.widman.biz]

Attachments:
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Re: GL4 Gear Lube
Posted by: jjohnsonjo ()
Date: March 28, 2019 05:03AM

[www.5speeds.com]


[www.ebay.com]



Or get some friends, or club to do it this way

[www.amazon.com]

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: GL4 Gear Lube
Posted by: jetcat ()
Date: March 28, 2019 05:33AM

I recently put in the Amsoil GL-4 and my transmission shifts like butter. I love it compared to the previous conventional oil that was in it before. 1966 LM.

Bob
Paso Robles, CA

Central Coast Corsa
1966 Turbo Corsa convertible
1966 Corsa 140 coupe but now with 110hp heads.

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Re: GL4 Gear Lube
Posted by: richard1 ()
Date: March 28, 2019 05:58AM

Brizo Wrote:
-------------------------------------------------------
> The NAPA's around here only stock 80-90 GL4 which
> works fine, except some say shifting resistance
> is higher when cold. They will probably order the
> 75-90 for you. I've also heard that Amsoil has a
> 75-90 GL4. And then some guys say their 4
> speeds shift fine with GL5, so...


They "shift fine" by not taking that much extra effort to engage the syncros, but if you were to analyze the oil after a period of time, you would find much more copper in the report, as the brass will wear more on each shift.

Restoration in Bolivia
Richard's Mini Pickup
Richard's Corvair
Richard's Renault Dauphine

Selection of the Right Motor Oil for the Corvair
Selection of the right transmission oil for the corvair
How to polish and restore stainless and aluminum trim

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Re: GL4 Gear Lube
Posted by: junkman ()
Date: March 28, 2019 08:26AM

I removed the GL5 that was installed a few years ago, when I had the engine out, with Brad Penn 80-90 GL4, and put in a bottle of Moly, and now my trans shifts much better.

---------------------------------------------------------------------------------------------------------------
Woodstock CT... Located on the Connecticut / Massachusetts border, approximately 6 miles from the center of Southbridge MA. About 45 minutes from Hartford CT. 1 1/2 hours West of Boston MA. Woodstock CT to Los Angeles CA 2,937.1 miles. 1 Mile as the crow flies to Big Bird's nest.

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Re: GL4 Gear Lube
Posted by: Frank DuVal ()
Date: March 28, 2019 09:08AM

OK, so how do you Amsoil guys get that large opening bottle into the differential?

I had to pour it into a regular gear lube bottle to squeeze it into the differential/transmission.

The cheap suction guns I find to buy are too leaky/loose too much valuable fluid.

Why did Amsoil make such a large opening, the stuff pours like water!confused smiley

Frank DuVal

Fredericksburg, VA

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Re: GL4 Gear Lube
Posted by: jjohnsonjo ()
Date: March 28, 2019 09:28AM

[www.harborfreight.com]

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: GL4 Gear Lube
Posted by: larry202br ()
Date: March 28, 2019 09:41AM

I use this: Gear Oil Pump

1961 rampside with a 65 / 67 110 engine, car four speed.
1965 convertible
1966 Custom two door/four door

KC0SKX
Olathe, ks
HACOA

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Re: GL4 Gear Lube
Posted by: JimBrandberg ()
Date: March 28, 2019 11:34AM

What is the Redline GL-4 that works well?
I remember reading a while ago that one of them is GL-4 for the transmission but not so good hypoid for the differential.

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: GL4 Gear Lube
Posted by: corvairsince70 ()
Date: March 28, 2019 12:14PM

Is the Amsoil 75-90 GL4 specified for hypoid gears?

Dennis
Nashville area
'68 Conv 140 PG
'66 Corsa Conv 180
'66 Corsa 140

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Re: GL4 Gear Lube
Posted by: Wagon Master ()
Date: March 28, 2019 05:47PM

Yes

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Re: GL4 Gear Lube
Posted by: joelsplace ()
Date: June 05, 2019 09:12AM

I just read specs for GL4 and part of the spec I read is hypoid gears so I'm confused on how any GL4 could not be for hypoid gears?
I noticed Shell Rotella HD tractor fluid says GL4.

Joel
Northlake, TX
4 Ultravans, Lost count at 100 Corvairs...

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Re: GL4 Gear Lube
Posted by: 66vairman ()
Date: June 05, 2019 09:41AM

joelsplace Wrote:
-------------------------------------------------------
> I just read specs for GL4 and part of the spec I read is hypoid gears so I'm confused on how any GL4 could not be for hypoid gears?
> I noticed Shell Rotella HD tractor fluid says GL4.

Jim and Joel --- The confusion arises from some folks who used Red Line MT-90 that some places call a GL-4. This lube is for transaxles that DO NOT USE HYPOID GEARS per the Red Line site (usually FWD transaxles). So NO it isn't recommended for a Corvair transaxle.

Red Line does make several GL-5 lubes and ONLY ONE that is 75W90 NS GL-5 is approved for "yellow metal" and synchronizers. The "NS" means it is buffered and modified to allow use in gear boxes. Some of the Crown V8 guys say it works well.



Edited 1 time(s). Last edit at 06/05/2019 09:42AM by 66vairman.

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Re: GL4 Gear Lube
Posted by: joelsplace ()
Date: June 05, 2019 10:49AM

The MT-90 doesn't claim to be GL-4 does it?

Joel
Northlake, TX
4 Ultravans, Lost count at 100 Corvairs...

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Re: GL4 Gear Lube
Posted by: Willt65 ()
Date: June 05, 2019 11:43AM

Yes

Will Teeter
Flintstone, MD
65 Corsa project

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Re: GL4 Gear Lube
Posted by: joelsplace ()
Date: June 05, 2019 12:55PM

It does:

MT-90 75W90 GL-4 Gear Oil

75W90 GL-4 gear oil (similar to SAE 5W40/10W40 engine oil viscosity)
Popular in Nissan, Mazda, Mitsubishi, VW/Audi, Lotus Elise/Exige, Toyota, Mendeola transmissions and Atlas transfer cases for Off Road
Offers quicker shifts, perfect synchronizer coefficient of friction
Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage
High performance gear protection and longer synchro life
Eliminates notchy shifting, even when cold
Satisfies the gear oil viscosity requirements of 75W90, 80W90, 90 and motor oil viscosities of SAE 40, 10W40 and 15W40
Recommended for GL-1, GL-3 and GL-4 applications, as well as where most special synchromesh fluids are specified

Since GL-4 is supposed to be for hypoid gears why isn't theirs ok?

Joel
Northlake, TX
4 Ultravans, Lost count at 100 Corvairs...

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Re: GL4 Gear Lube
Posted by: 66vairman ()
Date: June 05, 2019 01:18PM

I went online and Red Line has NEW MT oils and has dropped the warning about using MT oils with hypoid gears that was in therir old online data. NOTE not all the new Red Line MT oils are GL-4 rated - read the fine print.

I dislike these "boutique" lube companies like Red Line and Amsoil - a lot of claims and little data to back it up.

What say you Richard1.



Edited 1 time(s). Last edit at 06/05/2019 01:19PM by 66vairman.

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