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I've got a 2013 SD with the 6.7 liter. I just changed the ATF a month or so ago and I tried driving and once the trans Temps hit 160ish it gets sluggish and won't run right. Won't boost, or shift up. Let it cool down and it runs as it should, then once it gets to 160isg it bogs again. I'm using the Motorcraft LV. Ideas??
