<VV> Making sense of a gazillion posts on GL-4 vs. GL-5 (Yes, I did read them)

[J. R. Read]

Charlie,

On a 4spd (which shares the gear oil between tranny and diff),  essentially 
you want GL-4 in both.  Reason - protection for the sychronizers in the 
tranny AND the hypoid gear set in the diff.  BUT...  GL-4 is not on the 
shelf at the FLAPS, so you have to search for where to order.

When trying to order, you are presented with a myriad of products.  The 
discussion has been (to my way of thinking) primarily about what is the BEST 
product to order for manual trans Corvairs.  I'm not sure that there is 
agreement on that particular question.  There probably isn't.

Oils have changed since our cars were built.  There are several designations 
which did not exist in 1959.  So, it becomes a matter of figuring out what 
to (and not to) use based on today's labeling.

GL-5 is most likely wrong unless the labeling tells you specifically that it 
is for use with both synchronized tranny AND hypoid gear set.  Since most 
cars today are automatics, it's difficult to find something appropriate for 
our stick shift Corvairs.

I know that I did not address everyone's input in this summary, but I did my 
best to capsulize this for you.

Later, JR

----- Original Message ----- 
From: "Charlie via VirtualVairs" <virtualvairs at corvair.org>
To: "'Vairtec Corp'" <vairtec at comcast.net>
Cc: "'Virtual Vairs'" <virtualvairs at corvair.org>
Sent: Tuesday, April 07, 2015 8:52 PM
Subject: <VV> Making sense of a gazillion posts on GL-4 vs. GL-5 (Yes,I did 
read them)


> Nope I read them all, ~ and I hope this finds you in a better mood?
>
> I recently tore my '65 Corsa 4-speed transmission and differential apart,
> and a friend put them back together.
>
> He filled it up with GL-5 that he bought, and now it looks like we need to
> drain it out?
>
> So, I want to be sure before I have to throw away what he was helpful 
> enough
> to do for me.
>
> So now I'm just trying not to be confused by the plethora of repeated,
> concurring and dissenting opinions being posted, trying to make sense of 
> it
> all.
>
> Then, while ordering some parts from Clark's, I asked the tech guy who 
> said
> that GL-4 is correct for 4-speeds (and agreed that it should not be "GL-4
> hypoid"), and that their regimen is to use GL-5 for PGs only.
>
> I didn't ask him about non-synchro 3-speeds though ...
>
> Charlie
>
>
> -----Original Message-----
> From: VirtualVairs [mailto:virtualvairs-bounces at corvair.org] On Behalf Of
> Vairtec Corp via VirtualVairs
> Sent: Tuesday, April 07, 2015 3:59 PM
> To: virtualvairs at corvair.org
> Subject: Re: <VV> GL-5 gear oil is for automatics?
>
> Charlie, perhaps I should apologize in advance for being in a bad mood.
> Apparently you are just posting to this thread, not reading it, because
> yesterday I posted
>
> "Powerglide-equipped vehicles can use the newer GL-4/GL-5 products because
> the differential lube is not shared with the transmission. "
>
> Just sayin.'  Again.
>
> --Bob
>
>
> On 4/7/2015 6:48 PM, Charlie via VirtualVairs wrote:
>> Is it possible that GL-5 gear oil is for automatics, and since 99% of
>> "average" cars are auto, it's "safe" to recommend it, since so few are
>> NOT auto, there are not enough of us to be a problem for them?
>>
>> Just sayin' ...
>>
>> Charlie
>
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