EP Additives
Tony,
The gears in your boxes are different, but can use the same oil.
The straight cut gears in the transmission have simple lubrication requirements, and will live on 'average' gear lube.
The gears in your differential are bevel gears, and need the extreme pressure lube as those gear teeth slide by each other. Those additives are essential to get the most life out of a sliding gear set.
The additives will not hurt brass components, as the synchonizer bits of a modern transmission.
The worst modern oil is better than the best oil of years ago, and despite what the sheiks would have us believe - oil is cheap.
Stewart
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