If Only...
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The rest of the 6.0L, 4L80E, and NVG263 drivetrain is still as stock as when it left the GM assembly line. Mitch kicks himself for not getting the 8.1L/Allison combo, but even he had to make compromises somewhere. For now, the performance mods are limited to 5.13 gears in the axles and Flowmaster mufflers. View Related Article
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