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Synthetic oils use a whole 'nutter chemistry to obtain GL-5 compatibility.
The cold, hard., ruthless fact remains:
Every M35a2 on the plant that has been in goverment service since the mid 80's has had GL-5 oil in every transmission/transfer/differential.
Absolutely nothing bad has happened...
If you look at the lube order for M35a2 trucks they have been running GL5 since the mid 80's.
That means 20+ years of GL5 in the trucks and none of them have suffered from any soft of 'yellow metal failure'.