Has anyone had any sort of tranny problems which you could connect to using ATF other than Matic S. Even if you had zero problems, I would like to hear. I have used Matic J or S for the full 185,000 mile life of my truck and am considering doing another spill & fill before summer towing season starts. I tow about 25% of my total miles and have had no tranny problems at all, perhaps the best component in my truck. I've done a 12 qt flush @ 65000 miles and spill and fills @ 105,000 and 145,000.