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In 2009, the GMC Sierra 2500HD has a wheel bolt pattern of 8x180. When changing or tightening lug nuts on a vehicle, it's important to handle them with care. If you tighten them too much, there's a risk of breaking or stripping them, especially if they're old or rusty. Stripped lug nuts will just spin in place and become stuck. If this occurs, a mechanical press may be needed to remove them, potentially damaging the wheel. If a bolt snaps, it will require removing the rotor and unthreading it from the back. To avoid these issues, it's best to be cautious during the process.
It's actually 8x6.5, not 8x180.
The wheel bolt pattern for the 2009 GMC Sierra 2500HD is 8x180.
The GMC vehicles produced from 2003 to 2010 have a wheel bolt pattern of 8x165.1.