Shop parts and accessories that fit the 2025 GMC Sierra 3500 HD: tonneau covers, lighting, steps and running boards, suspension, exhaust, bumpers and more from the brands truck owners trust. Every part on this page is matched to the 2025 GMC Sierra 3500 HD using manufacturer fitment data. Use the vehicle selector above to narrow results by trim, cab, bed length and engine.
ANZO USA
ANZO USA 311457 LED Tail Light Assembly Set for 2019-2022 GMC Sierra
Sale price$428.99
In Stock
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ANZO USA
ANZO USA 311458 LED Tail Light Assembly Set with Smoke Lens for GMC Sierra
Sale price$428.99
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TrailFX
TrailFX 210201 100-Gallon Aluminum Diesel and Non-Potable Water Transfer Tank
Sale price$1,009.99
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TrailFX
TrailFX BUG04 2-Inch Rear Lift Leaf Spring Block Kit for Chevrolet Silverado and GMC Sierra 3500 HD
Sale price$111.99
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Bilstein
Bilstein B6 4600 Shock Absorber 24-196437 for Stock-Height Light Trucks and SUVs
Sale price$109.00
In Stock
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Bilstein
Bilstein B6 4600 24-196444 Monotube Suspension Shock Absorber
Sale price$92.00
In Stock
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Bilstein
Bilstein B8 5100 Monotube Suspension Shock Absorber 24-196468
Sale price$123.00
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Bilstein
Bilstein B8 5100 24-218023 Monotube Suspension Shock Absorber
Sale price$123.00
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Bilstein
Bilstein B8 5100 Monotube Shock Absorber 24-218030 for Lifted Trucks
Sale price$123.00
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Raptor Series
Raptor Series 1701-0017BT 6-Inch OEM-Style Running Boards, Black Textured Aluminum for Chevy Silverado and GMC Sierra Regular Cab
Sale price$440.99
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Raptor Series
Raptor Series 1701-0041BT 6-Inch OEM-Style Running Boards, Black Textured Aluminum
Sale price$481.99
In Stock
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Raptor Series
Raptor Series 1701-0052BT 6-Inch OEM-Style Running Boards, Black Textured Aluminum for Chevy Silverado and GMC Sierra
Sale price$499.99
In Stock
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Bilstein
Bilstein B8 5160 Remote Reservoir Shock Absorber 25-311846
Sale price$299.00
In Stock
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Bilstein
Bilstein B8 5160 Remote Reservoir Shock Absorber 25-311891
Sale price$299.00
In Stock
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Bilstein
Bilstein B8 5160 25-312027 Remote Reservoir Front Shock Absorber
Sale price$299.00
In Stock
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Raptor Series
Raptor Series 1901-0041BT Tread Step Running Boards, Black Textured Aluminum for Chevy Silverado and GMC Sierra
Sale price$481.99
In Stock
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Raptor Series
Raptor Series Tread Step Running Boards 1901-0052BT for 2019-2026 Chevy Silverado and GMC Sierra Crew Cab
Sale price$499.99
In Stock
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Raptor Series
Raptor Series 2001-0017BT Oval Running Boards, Black Textured Aluminum for Chevy Silverado and GMC Sierra
Sale price$440.99
In Stock
★ Mission Ready
Raptor Series
Raptor Series 2001-0041BT Oval Running Boards, Black Textured Aluminum for Chevy Silverado and GMC Sierra
Sale price$481.99
In Stock
★ Mission Ready
Raptor Series
Raptor Series 2001-0052BT Oval Running Boards, Black Textured Aluminum for Chevy Silverado and GMC Sierra Crew Cab
Sale price$499.99
In Stock
★ Mission Ready
Raptor Series
Raptor Series Sawtooth Running Boards 2101-0017BT, Black Textured Aluminum for Chevy Silverado and GMC Sierra
Sale price$477.99
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Raptor Series
Raptor Series 2201-0041BT 5-Inch OEM-Style Full-Tread Running Boards, Black Textured Aluminum for Chevy Silverado and GMC Sierra
Sale price$481.99
In Stock
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Raptor Series
Raptor Series 2201-0052BT 5-Inch OEM-Style Full-Tread Running Boards, Black Textured Aluminum for Chevy Silverado and GMC Sierra Crew Cab
Sale price$499.99
In Stock
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Raptor Series
Raptor Series 2301-0052BT Sport Step Running Boards, Black Textured Aluminum, 2019-2026 Chevy Silverado/GMC Sierra
Sale price$574.99
In Stock
★ Mission Ready
About 2025 GMC Sierra 3500 HD Parts & Accessories
The Sierra 3500 HD is GMC's heaviest-duty pickup, offered in single- and dual-rear-wheel versions with Denali luxury and the 6.6L Duramax. It was refreshed for 2024. 2025 Sierra 3500 HDs share fitment with 2024.
Truck Army currently carries 148 parts and accessories matched to the 2025 GMC Sierra 3500 HD using manufacturer fitment data. New parts that fit the 2025 GMC Sierra 3500 HD are added to this page automatically.
Popular 2025 GMC Sierra 3500 HD upgrades
- Vent Visors & Window Deflectors – Window deflectors that let you crack the windows of the 2025 GMC Sierra 3500 HD in rain and cut wind noise.
- Transfer & Fuel Tanks – In-bed transfer and auxiliary fuel tanks that extend range for work and towing with the 2025 GMC Sierra 3500 HD.
- Toolboxes – Crossover, chest and side-mount toolboxes that keep gear secure in the 2025 GMC Sierra 3500 HD bed.
- Suspension – Leveling kits, lift kits, shocks and coilovers to fix factory rake, fit bigger tires or improve the ride of your 2025 GMC Sierra 3500 HD.
- Steps & Running Boards – Running boards and steps sized for the 2025 GMC Sierra 3500 HD cab length.
- Running Boards – Running boards and side steps sized for the 2025 GMC Sierra 3500 HD.
2025 GMC Sierra 3500 HD fitment tips
- Beds are 6 ft 9 in (standard) or 8 ft 2 in (long) - match covers, toolboxes and transfer tanks to yours.
- The 2024 refresh changed the front fascia, so many bumpers and grille guards are split into 2020-2023 and 2024+.
- 3500 dually trucks need DRW-specific fender flares and running boards.
- Factory-lifted trims like ZR2 and AT4X do not need leveling kits and may not accept standard lift kits.
- Not sure about your trim, cab or bed length? Use the vehicle selector at the top of the page, or contact us with your VIN and we will confirm fitment before you order.
Other model years: 2024 GMC Sierra 3500 HD · 2026 GMC Sierra 3500 HD
Shop all GMC Sierra 3500 HD parts
Looking beyond this year? Shop all GMC Sierra 3500 HD parts for every model year, or browse by category: Running boards & side steps · Lift & leveling kits · Shocks · Floor liners · Bed liners & bed mats · Tonneau covers · Toolboxes. See every vehicle on our Shop by Truck page.