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    LB7: 6th gear kit or new tranny?

    So I have an 03 Duramax with the LB7 5 speed. Im looking to either get the 5 to 6 gear kit or a new tranny, doesn't necessarily need to be built. Im mostly wanting the 6th gear due to highway driving. Mods- six-gun tuner, full bore exhaust manifold, leveling kit with 33's. I need advice guys, I...