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Choose your trim in My Garage to confirm exact fit.
Yukon Gear & Axle
Part # YC G40000278
$819.89
COMP Cams
Part # 189-400-13
$616.44
Nitrous Express
Part # 15769
$78.27
COMP Cams
Part # 13702-KIT
$209.40
Cometic Gasket
Part # C5751-056
$131.62
Standard Motor Products
Part # EGV1289
$422.47
Fel-Pro
Part # 72401
$5.91
Standard Motor Products
Part # CP3195
$160.98
Wehrli
Part # WCF100113-BB
$423.23
HP Tuners
Part # H-M04-00
$87.03
Bando
Part # 4PK902F
$18.00
Cometic Gasket
Part # C5751-075
$131.62
COMP Cams
Part # 896801
$347.39
Cometic Gasket
Part # C5751-120
$249.06
Yukon Gear & Axle
Part # YG GM11.5-373
$876.89
Mishimoto
Part # MMIG-LSRD-07
$68.39
COMP Cams
Part # 54-408-11
$442.84
Dorman
Part # 264-882
$122.48
Yukon Gear & Axle
Part # YA G20768560
$148.89
COMP Cams
Part # 4854-8
$35.95
This page groups parts listed for the 2018 GMC Sierra 3500 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 2018 GMC Sierra 3500 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 COMP Cams, Cometic Gasket, King Engine Bearings, ACL, and Wehrli, 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.
