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What gear oil?

pakrat

pakrat

Badlands
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Any reason not to use Amsoil 75W-90 in the rear axle? It calls for 75W-85 so viscosity is a little off.
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swami37

swami37

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What do the Ford engineers know? Go for it.
 
dgorsett

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Probably makes no difference, but unless there's water in it why change so soon?
 
NC_Pinz

NC_Pinz

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The difference in viscosity between 85 and 90 weight oil is negligible from a practical usage standpoint.
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