What kind of lubricant do your use after replacing the rear axle seal? on 1991 GMC S15 Jimmy

My mechanic has just replace the rear axle seal. We want make sure that we are using the correct oil.

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2 answers
If he is a real mechanic he should know. 80w-90w gear oil
90w gear oil unless it has positracion then use pos attive plus 90w gear oil