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Trusted Since 1957
Nitrous Express
$78.27
Cometic Gasket
$135.77
Cometic Gasket
$123.94
Fel-Pro
$92.54
COMP Cams
$618.41
Fel-Pro
$88.90
Yukon Gear & Axle
$40.89
Gates
$79.18
Fel-Pro
$10.56
Fleece Performance
$25.01
Granatelli Motor Sports
$229.43
Fleece Performance
$31.54
Mishimoto
$418.76
Cometic Gasket
$123.94
Fel-Pro
$55.32
BD Diesel
$776.69
Cometic Gasket
$135.77
Cometic Gasket
$150.81
King Engine Bearings
$58.97
Cometic Gasket
$135.77
Yes, all parts displayed on this page are verified to fit the 2012 GMC Sierra 3500 HD using VCDB fitment data. Our fitment information comes directly from manufacturers and is cross-referenced with industry-standard vehicle databases.
We offer a wide selection of engine & drivetrain parts specifically designed for the 2012 GMC Sierra 3500 HD. All parts shown are verified for fitment and include detailed product information to help you choose the right option.
We carry parts from trusted brands including Cometic Gasket, COMP Cams, King Engine Bearings, Yukon Gear & Axle, 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.