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Choose your trim in My Garage to confirm exact fit.
Cometic Gasket
$185.74
aFe
$546.87
Yukon Gear & Axle
$228.89
Victor Reinz
$50.73
Yukon Gear & Axle
$10.89
Fel-Pro
$48.50
Dayco
$34.79
Nitrous Express
$78.27
Yukon Gear & Axle
$540.89
Fleece Performance
$43.51
Yukon Gear & Axle
$24.89
Dorman
$111.67
Clevite
$12.07
Victor Reinz
$258.42
Yukon Gear & Axle
$399.89
Yukon Gear & Axle
$1073.89
Granatelli Motor Sports
$249.38
COMP Cams
$975.85
Clevite
$46.57
Fel-Pro
$10.75
This page groups parts listed for the 2003 GMC Sierra 2500 HD. Some products fit every trim, while others depend on submodel, engine, drivetrain, or brake package. Use your trim in My Garage or the product page fitment check to confirm exact fit.
We offer a wide selection of engine & drivetrain parts for the 2003 GMC Sierra 2500 HD. This page narrows the catalog to the year, make, and model; use your trim on product pages to confirm exact fit when a part only fits certain submodels.
We carry parts from trusted brands including Yukon Gear & Axle, Clevite, Cometic Gasket, King Engine Bearings, and Fel-Pro, plus many more. Filter by brand to find your preferred manufacturer.
Most in-stock items ship within 1-2 business days. Shipping rates are calculated at checkout based on your location.
Warranty coverage varies by manufacturer but typically ranges from 1 year to lifetime. Each product page includes specific warranty information from the manufacturer.
