<VV> Red Line Oil Web Site - answer?

[BobHelt at aol.com]

No it wasn't..... just a mil-Spec for the x-axle. The reply states info  
abou the synchros but ignores the hypoid gear issue.
Bob Helt
 
 
In a message dated 4/6/2015 4:31:30 P.M. US Mountain Standard Time,  
virtualvairs at corvair.org writes:

Some of  you are not going to like the answer that I got back from Red Line 
since  they are saying that GL-5 was the original spec for Corvair.  Was it 
 
even around in the '60s?

See their answer below.

PS:  I  did NOT ask about posi.

Later, JR

Thank you for contacting Red  Line Oil, in your Corvair transaxle the 
75W90NS 
is recommended as a GL-5  was originally specified.
The 75W90NS is a non slippery gear oil, suitable  for use with synchros, it 
isn’t corrosive to brass, bronze or copper as it  contains a copper 
deactivator as do all of our GL-5 gear  oils.

Regards, Dave