2015-2019 GMC Sierra 3500HD 6-Inch Running Boards

Shop 6-inch running boards and nerf bars for listed 2015-2019 GMC Sierra 3500HD applications. Match the exact model year, cab configuration, and any product-specific vehicle or engine notes before ordering; a 6-inch width does not establish fitment.

Fitment first: Crew Cab, Double Cab, and Regular Cab applications can require different products. Some current listings cover narrower year ranges or explicitly identify Duramax. Do not assume Duramax and other applications are interchangeable; the individual product page controls the exact supported years and configuration.

Choose Your Cab Configuration

Choose the Right 6-Inch Step

After confirming exact year and cab, compare any engine or application notes, step profile, material, finish, dimensions, included brackets or hardware, package contents, exclusions, and installation notes.

Related GMC Sierra 3500HD Collections

Frequently Asked Questions

Will every product fit every 2015-2019 Sierra 3500HD?

No. Current listings can have narrower year ranges, different cab applications, or additional vehicle notes. Verify the exact product page before ordering.

Are Duramax and other applications automatically interchangeable?

Do not assume so. If an individual listing calls out Duramax or another application detail, use that product-specific information when checking your truck.

Can different cab configurations share the same boards?

Do not assume so. Crew Cab, Double Cab, and Regular Cab dimensions can change board length, brackets, mounting points, and step position.

What should I verify before installation?

Confirm exact year, cab, and any engine or vehicle-specific notes, then review dimensions, package contents, included brackets or hardware, exclusions, and installation instructions.

Aftermarket trademark disclaimer: People Auto Parts is not affiliated with, sponsored by, or endorsed by General Motors LLC. GMC, Sierra, Sierra 3500HD, GM, and related names and trademarks belong to their respective owners and are used only to identify compatible applications. Products are aftermarket parts unless an individual listing expressly states otherwise.