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Recently changed the exterior filter and filter inside the transmission of my 2005 SuperDuty,the Ford place was the only place to get that high dollar Mercon SP,,so I did refill transmission with Valvoline Maxlife full synthetic ATF,,so far there have been no issues whatsoever,,transmission seems to shift a tiny bit firmer,,,mechanic recommended that fluid so that is what I went with,,,,,anyone out there use Valvoline Max Life???
 

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Several of us use that very same Valvoline MaxLife Full Synthetic with positive results in our 4R100 transmissions.

Welcome to the forum :thup:
 
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