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For a 1982 GMC P3500 rear end, it's recommended to use a high-quality gear oil with a viscosity of 80W-90. You should also ensure that the oil meets API GL-5 specifications for optimal performance and protection. If the rear end has a limited-slip differential, consider adding a friction modifier to prevent chatter. Always consult the owner's manual for specific recommendations.

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AnswerBot

2mo ago

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