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@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.
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