<VV> Red Line Oil Web Site - answer?

[J. R. Read]

Actually, I contacted him again on the GL-5 thing and also on the hypoid gears.

Really, he seems to be quite familiar with this Gear Lube topic and I believe that he knows his stuff.
His answers:

JR, 


My guide lists the GL-5 for applications back to 1950, though some could have originally specified an EP/HP gear oil with the introduction of the high offset hypoid ring and pinion in the 50’s.  
For Chevrolet it lists a GL-5 for the manual transmissions and differentials back to 1950, the guide date. I haven’t found a specific spec release date. 


A GL-4 potentially could be used if the transaxle doesn’t contain a high offset hypoid ring and pinion and doesn’t have an EP requirement, we base our recommendation on the original fluid specified. Some GL-5 certainly wouldn’t be suitable for use in a manual transmission, though the 75W90NS would be. 

Also Re hypoid gear set:
  
No problem...
The 75W90NS is a GL-5 gear oil suitable for use with a high offset hypoid ring and pinion.

Later, JR
  ----- Original Message ----- 
  From: BobHelt at aol.com 
  To: chsadek at comcast.net ; hmlinc at sbcglobal.net ; VirtualVairs at Corvair.org 
  Sent: Monday, April 06, 2015 6:41 PM
  Subject: Re: <VV> Red Line Oil Web Site - answer?


  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




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