Need help clutch or rear diff.
I’m having an issue and I don’t know what it is. When I do a mild launch on my car the tires start to spin then is they stop and seems like it’s slipping. Can figure out if it’s the clutch or too much friction modifier in the rear. When I replaced the rear differential fluid I used the royal purple limited slip oil plus almost a whole 4 oz bottle of Ford friction modifier because I didn’t notice the royal purple had it in it already. Car has 58k miles on it. What are your thought? Thank you
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