Upgrading the headlights on your 2004 GMC Sierra—whether to modern LED units, projector assemblies, or even just fresh halogen housings—is a fantastic way to improve nighttime visibility and refresh the truck's front-end appearance . However, one critical step is often overlooked: aiming your new headlights correctly. Even the most expensive, high-tech headlights are dangerous if they point at the sky, blinding oncoming traffic, or at the ground, failing to illuminate the road ahead. Fortunately, aiming the headlights on your GMT800 Sierra is a straightforward process you can complete at home with basic tools and about 30 minutes.
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