686+ 2018 GMC Sierra 3500 HD Engine & Drivetrain Parts - Page 22

Engine & Drivetrain (686 products)

Cometic GM LS1 SB 4.060 inch Bore .140 inch MLS Head Gasket

Cometic Gasket

Part # C5751-140

Fits All Trims

Cometic GM LS1 SB 4.060 inch Bore .140 inch MLS Head Gasket

$249.06

Cometic GM LS1 SB 4.060 inch Bore .027 inch MLS Head Gasket

Cometic Gasket

Part # C5751-027

Fits All Trims

Cometic GM LS1 SB 4.060 inch Bore .027 inch MLS Head Gasket

$97.74

Yukon Gear Master Overhaul Kit For GM 9.25in IFS Diff / 11+

Yukon Gear & Axle

Part # YK GM9.25IFS-B

Fits All Trims

Yukon Gear Master Overhaul Kit For GM 9.25in IFS Diff / 11+

$706.56

Cometic GM LS1 SB 4.130 inch Bore .120 inch MLS Head Gasket

Cometic Gasket

Part # C5317-120

Fits All Trims

Cometic GM LS1 SB 4.130 inch Bore .120 inch MLS Head Gasket

$249.06

COMP Cams

Part # CL54-414-11

Fits All Trims

COMP Cams Cam & Lifter Kit LS1 XR269HR

$869.81

Cometic GM LS1 SB 4.060 inch Bore .089 inch MLS-5 Head Gasket

Cometic Gasket

Part # C5751-089

Fits All Trims

Cometic GM LS1 SB 4.060 inch Bore .089 inch MLS-5 Head Gasket

$143.45

King GM 294/325/345/364CI 4.8/5.3/5.7/6.0L L20/LS1/LS2/LS4/LS6 (Size 001) Main Bearing Set

King Engine Bearings

Part # MB5293SI001

Fits All Trims

King GM 294/325/345/364CI 4.8/5.3/5.7/6.0L L20/LS1/LS2/LS4/LS6 (Size 001) Main Bearing Set

$70.37

Cometic GM LS Gen-3/4 Small Block V8 .086in MLS Cylinder Head Gasket - 4.000in Bore

Cometic Gasket

Part # C5477-086

Fits All Trims

Cometic GM LS Gen-3/4 Small Block V8 .086in MLS Cylinder Head Gasket - 4.000in Bore

$143.45

Husky Liners

Part # 09041

Choose Trim

Husky Liners 2014 Chevrolet/GMC Silverado/Sierra 1500 Ext Cab Pickup Husky Underseat GearBox Storage

$169.99

aFe Power Front/Rear Diff Cover Kit w/ Oil 11-19 GM Diesel Trucks V8 (AAM 9.25-12 & AAM 11.5-14)

aFe

Part # 46-7707AB

Fits All Trims

aFe Power Front/Rear Diff Cover Kit w/ Oil 11-19 GM Diesel Trucks V8 (AAM 9.25-12 & AAM 11.5-14)

$982.75

Dayco

Part # 4PK926EE

Fits All Trims

POLY RIB BELT, DAYCO

$24.41

Nitrous Express

Part # 20935-05

Fits All Trims

Nitrous Express GM LS 78mm 3-Bolt Nitrous Plate Kit (50-350HP) w/5lb Bottle

$957.35

COMP Cams

Part # 4942CPG

Fits All Trims

COMP Cams Degree Kit LS Heads-Off

$296.88

Fel-Pro

Part # 35633

Fits All Trims

Fel-Pro Chevrolet Silverado 1500 35633 Multi-Purpose O-Ring

$1.50

Nitrous Express

Part # 20933-00

Fits All Trims

Nitrous Express GM LS 102mm Nitrous Plate Kit (50-400HP) w/o Bottle

$878.16

Fel-Pro

Part # 73853

Fits All Trims

Fel-Pro Chevrolet Silverado 2500 HD 73853 Transfer Case Adapter Gasket

$14.46

Wehrli

Part # WCF100199

Fits All Trims

Wehrli 17-24 Chevrolet/GMC 6.6L L5P Duramax Up Pipe Bolt Kit

$63.49

COMP Cams

Part # 4854-1

Fits All Trims

COMP Cams Guide Plate GM LS1 5/16 Flat

$9.95

COMP Cams

Part # 54-475-11

Fits All Trims

COMP Cams Camshaft LS1 305Lrr HR-115

$535.41

Nitrous Express

Part # NX933

Fits All Trims

Nitrous Express EFI Nitrous Plate Conversion GM LS 102mm

$415.23

Frequently Asked Questions

Do these parts fit my 2018 GMC Sierra 3500 HD?

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.

What engine & drivetrain options are available for my 2018 GMC Sierra 3500 HD?

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.

What brands make parts for the 2018 GMC Sierra 3500 HD?

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.

How fast do 2018 GMC Sierra 3500 HD parts ship?

Most in-stock items ship within 1-2 business days. Shipping rates are calculated at checkout based on your location.

What warranty do your 2018 GMC Sierra 3500 HD parts come with?

Warranty coverage varies by manufacturer but typically ranges from 1 year to lifetime. Each product page includes specific warranty information from the manufacturer.

2018 GMC Sierra 3500 HD(3,671 parts)

2018 GMC Sierra 3500 HD(3,671 parts)

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Other GMC Sierra 3500 HD Years

Engine & Drivetrain (686 products)

Cometic GM LS1 SB 4.060 inch Bore .140 inch MLS Head Gasket

Cometic GM LS1 SB 4.060 inch Bore .027 inch MLS Head Gasket

Yukon Gear Master Overhaul Kit For GM 9.25in IFS Diff / 11+

Cometic GM LS1 SB 4.130 inch Bore .120 inch MLS Head Gasket

COMP Cams Cam & Lifter Kit LS1 XR269HR

Cometic GM LS1 SB 4.060 inch Bore .089 inch MLS-5 Head Gasket

King GM 294/325/345/364CI 4.8/5.3/5.7/6.0L L20/LS1/LS2/LS4/LS6 (Size 001) Main Bearing Set

Cometic GM LS Gen-3/4 Small Block V8 .086in MLS Cylinder Head Gasket - 4.000in Bore

Husky Liners 2014 Chevrolet/GMC Silverado/Sierra 1500 Ext Cab Pickup Husky Underseat GearBox Storage

aFe Power Front/Rear Diff Cover Kit w/ Oil 11-19 GM Diesel Trucks V8 (AAM 9.25-12 & AAM 11.5-14)

POLY RIB BELT, DAYCO

Nitrous Express GM LS 78mm 3-Bolt Nitrous Plate Kit (50-350HP) w/5lb Bottle

COMP Cams Degree Kit LS Heads-Off

Fel-Pro Chevrolet Silverado 1500 35633 Multi-Purpose O-Ring

Nitrous Express GM LS 102mm Nitrous Plate Kit (50-400HP) w/o Bottle

Fel-Pro Chevrolet Silverado 2500 HD 73853 Transfer Case Adapter Gasket

Wehrli 17-24 Chevrolet/GMC 6.6L L5P Duramax Up Pipe Bolt Kit

COMP Cams Guide Plate GM LS1 5/16 Flat

COMP Cams Camshaft LS1 305Lrr HR-115

Nitrous Express EFI Nitrous Plate Conversion GM LS 102mm

Frequently Asked Questions

Do these parts fit my 2018 GMC Sierra 3500 HD?

What engine & drivetrain options are available for my 2018 GMC Sierra 3500 HD?

What brands make parts for the 2018 GMC Sierra 3500 HD?

How fast do 2018 GMC Sierra 3500 HD parts ship?

What warranty do your 2018 GMC Sierra 3500 HD parts come with?