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I know some people recommend using the Royal Purple differential fluid which has the built-in friction modifier. But a few have chimed in saying that the amount the RP has stock is not enough.
Chevy themselves has changed the manual on how much of the AC Delco to pour in to almost double what was originally recommended.
I'm thinking of using the compatible Mobil 1 diff fluid with the recommended AC Delco FM to the new specs like you seem to have done.
What are your thoughts on this?
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