Correct break-in as listed in the Ford mechanic manual is as follows. No hard throttle for 50 miles, No downshifting that could cause rearend to lock- up. Drive for 10 miles to get oil to temperature then allow oil to cool before driving additional miles. All of this is to allow the oil to help temper the gears. Now I have done this because I didn't want to take chances but 99% of everyone that I know it is never done and they have not had any failures with FMS gears.
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