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Old 06-24-2011, 12:44 PM
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Which gear oil?

I want to change the gear oil out of my 67 El Camino, it has a GM 12 bolt with posi and 4.10 gears. What do you recommend? I have read that you should not use synthetic gear oil for this. How much oil will it take and should I use an additive for the posi unit?

Also, what oil weight will be best?
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