**Although the Royal Purple gear oil contains friction modifier, we highly recommend including the Ford Racing friction modifier along with the gear oil when refilling your rear end.**
Due to Hazmat regulations, lubricants/fluids cannot be shipped to APO/FPO addresses.
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On a 13 automatic, you are going to be roughly at 2400rpm at 70. I ran this ratio in my 2011 v6 and it was still perfectly fine on the highway and made a huge difference. You will sacrifice a bit in fuel economy, but it is negligible.
Answered by Karson S. from Hewitt | Comment 0 0
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