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Im quite sure you have a 6L80E not a 6L90E unless you did some kind of swap.
I vote for 4.10's.
You might end up saving money by purchasing a small commuter car. Something used for under $5000 with lower miles. At the least you would keep the miles off your truck. I don't usually recommend multiple vehicles but if your commuting 80 miles a day, that's where you would start to benefit from a second car.
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