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Since I first posted this question I have lifted my truck and added larger wheels and tires. The vibration is more pronounced in first gear now when I'm accelerating hard. It goes away at higher rpms in first and is less noticeable in second gear. Tires can be eliminated as I have brand new ones now. I still notice the vibration when the torque converter unlocks at highway speeds but it's less noticeable than when it's in first gear under hard acceleration. Any more ideas? I still have not had the pcm codes checked.
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