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Re: What gear lube for differantial?
Posted by: JimBrandberg ()
Date: April 15, 2019 04:39AM

I heard from someone who bought Lube King on Ebay listed as GL-4 but received GL-5 so I will not be pursuing that idea.
I had previously asked the seller if the oil said anything about being okay for synchromesh transmissions on the back label and was given a 1-800 number for Warren Distributions. A visit to Warren Distributions website did not show the Lube King label.
Anyway, I've sort of answered my own question but thought I would follow up here for posterity.

Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: What gear lube for differantial?
Posted by: JimBrandberg ()
Date: April 15, 2019 09:53AM

I've settled on Brad Penn (Penn-Grade 1) Classic multi-purpose GL-4 SAE 80W-90 gear oil. Product code 7729 or 77296. I think it has everything we need for our brass transmission parts and differential EP (extreme pressure) needs.
I read the 11 page Richard1 paper, printed out the Product Data Sheet and called Brad Penn (Penn-Grade 1) since I wasn't sure about the EP characteristics after all that.
I've ordered a case of 12 quarts on EBAY for $82 by the time they also tack on MN sales tax. At $7 a quart it is cheaper then the Sta-Lube 85/90 that I've been buying at NAPA for $36 a gallon.
I don't know why it's so cheap on EBAY but there's more than 1 seller at around the same price.

I'll probably still put GL-5 in PG differentials.

I don't know what I'll use if I want synthetic.

Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: What gear lube for differantial?
Posted by: alphasud ()
Date: April 16, 2019 02:08PM

I know there is a ton of debate on the GL-4 and GL-5 fluids. I have been a tech since 1987. To date have never seen synchro damage due to using a GL-5 in a GL-4. Was a Saab technician where GL-4 75 weight was used. Synchro damage was always the result of the loose nut behind the wheel not the lubricant used.

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Re: What gear lube for differantial?
Posted by: stitch ()
Date: April 16, 2019 02:29PM

^^^Good one!^^^ smileys with beer

"If you can't fix it with a Hammer, you have an Electrical problem."
Stitch...
Schertz, Texas.
(Smallish town/burg 17 mi. NE of San Antonio)

'Ms Penny'
!967.. 4th body
8th off the line

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Re: What gear lube for differantial?
Posted by: American Mel ()
Date: April 16, 2019 03:35PM

alphasud Wrote:
-------------------------------------------------------
> I know there is a ton of debate on the GL-4 and
> GL-5 fluids. I have been a tech since 1987. To
> date have never seen synchro damage due to using a
> GL-5 in a GL-4. Was a Saab technician where GL-4
> 75 weight was used. Synchro damage was always the
> result of the loose nut behind the wheel not the
> lubricant used.


Hmmm, it was my understanding that the GL4 vs GL5 issue was not synchro damage from the lube, but rather the way they operate with the different oils.
Our trannies do not seem to want to shift very smoothly with the GL5 which causes them to experience undue wear from clashing into gear.

Been driving a stick my entire life, so even though the "NUT behind the wheel" may be not be perfect, he DOES know how to operate a manual transmission.

.
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WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater
'67 A/C Moredoor Monza - 140 4-spd. driver

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Re: What gear lube for differantial?
Posted by: joelsplace ()
Date: April 16, 2019 03:40PM

Mel, that may be an issue with some oils but the technical issue with GL5 is the sacrificial EP additives that bond to the metal tear microscopic bits of the brass off when they do their job. This prematurely wears out the blocker rings or at least that is the story as best I understand it.

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

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Re: What gear lube for differantial?
Posted by: JimBrandberg ()
Date: April 17, 2019 07:03AM

I would agree with Joel, mainly because I think that agrees with Richard1 11 page paper.
I might just run anything in my own Corvair but feel obligated to be more careful with other people's cars.

Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: What gear lube for differantial?
Posted by: richard1 ()
Date: April 18, 2019 08:48AM

Joel is right. That is how it works. Now if you shift like a little old lady, with lots of time between shifts and people honking at you, the pressure may not be enough to peel the brass. The harder you shift, the more wear as it forces the cones together harder and heats up, making the sulfur/phos stick more and pull more.

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