[Healeys] Dave Dougan's overdrive part 2

[Awgertoo at aol.com]

GL4 oil (whether 90 weight or heavier) is compatible with "yellow  metals" 
such as can be found in Healey (and I'm sure Triumph)  transmissions.  GL5 
oil is compatible with steel gears which can be  found in differentials but 
it is corrosive to yellow metal.   Moral:  Use GL4 in the transmission and 
GL5 in the diff.
 
Best--Michael Oritt
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In a message dated 11/14/2009 9:41:19 P.M. Eastern Standard Time,  
ynotink at msn.com writes:

You can  use heavier oils in the overdrive. As a matter of fact Triumph
specified 90  weight GL4 in their trannies, and therefore must have 
considered
it safe  for their overdrives which up to about 1973 were identical to  
ours.