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Use a good synthetic gear oil. Some even have an additive that replace "friction modifier". It's pricey, but well worth it. 75/90 should be fine as far as weight goes. Call Hall's Gulf at 732-657-0921 and ask for Bryant. He may be able to do the swap for you and save you some money ( as opposed to a regular shop). He's an excellent mechanic and the only person I let touch my baby.
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