As Maurice said, any oil with EP additives will attack brass and bronze parts very aggresively. Almost any WW2 gearbox has bronze selectors so synchro or not, do not use EP / class 5 oils at all.
A Sherman gearbox shares its oil with the controlled differential steering system and the final drives. If you put EP into the final drives (as used in most modern tracked vehicles) it will migrate to the steering and main gearbox so no steering, brakes or synchro !
David
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