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2003 GMC SIERRA 1500 HD Parts and Accessories
Showing In Stock Items. Show All 621 Items.
Fel-Pro Timing Cover Gaskets
The chain of command between a crankshaft, camshaft, and engine valves is central to your vehicle's basic movement—which is why it's so important to protect the timing belt. Fel-Pro timing cover gaskets provide a tight seal to keep contaminants out of the gear shaft area. They're offered in hundreds of single or multi-piece sets for OE-style fitment on a wide variety of cars, trucks, vans, and SUVs; gaskets for industrial use are also available. Ideal for stock replacement (not intended for racing applications), Fel-Pro gaskets are made from materials such as fiber, cork, and rubber. Choose the kit which corresponds to your year/make and engine application.
( 550 )
$47.99
Melling Factory Hydraulic Roller Lifters
Melling factory replacement hydraulic roller lifters are designed and built to get the job done while ensuring efficient performance and quiet valve train operation. They are perfect for when you're ready to freshen up your engine. Melling factory hydraulic roller lifters are manufactured from the finest materials and designed for the proper fit and long dependable lifter life.
( 20 )
$24.99
Red Line GL-5 Gear Oil
Red Line GL-5 gear oil has been engineered to provide the highest degree of protection and improvement of your differential efficiency. Formerly Lightweight gear oil, this new formula contains additional friction modifiers for suitability with clutch-type limited slip differentials, and for most, no additional friction modifiers would be required. This gear oil offers excellent lubrication, a high viscosity index, and the ability to lower operating temperatures, as well as exceeding API GL-5 specifications. Reduce friction for better performance--add the improved formula of Red Line GL-5 gear oil.
( 94 )
$21.74
Fel-Pro PermaTorque MLS Head Gaskets
Fel-Pro PermaTorque MLS head gaskets provide the robust seal needed to contain peak combustion pressures and temperatures—and to withstand the significant casting motion encountered in many of today's automotive engines. The gaskets feature multiple layers of steel, precisely engineered sealing beads, and advanced polymer coatings to maintain a proper contact pressure between the cylinder head and block. Unlike other multi-layer steel head gaskets, PermaTorque MLS seals also include a proprietary blue aftermarket coating that accommodates a wider range of surface finishes. These gaskets are manufactured using precision tooling to ensure exact sealing bead location and profile. Order the model recommended for your specific vehicle and engine application.
( 86 )
$49.99
Fel-Pro Rear Main Seal Cover Gaskets
Fel-Pro rear main seal cover gaskets are designed to fit between the engine block and rear main seal cover. They are manufactured from quality materials and install in the factory location to ensure a direct fit.
( 39 )
$30.99
Summit Racing™ Timing Cover Gasket Kits
Summit Racing™ timing cover gasket kits provide a tight seal to keep contaminants out of the gear shaft area. They're offered for OE-style fitment on a wide variety of cars, trucks, vans, and SUVs. Choose the kit which corresponds to your year/make and engine application.
( 30 )
$40.99
Fel-Pro Performance Valve Cover Gaskets
Fel-Pro Performance valve cover gaskets are an excellent choice for engines, especially those that produce high horsepower. Fel-Pro performance valve cover gaskets are available in many materials for a variety of applications and needs. When your engine needs new gaskets, look no further than Fel-Pro performance gaskets for the best sealing power.
( 487 )
$29.99
King SI-Series Main Bearings
King SI-Series main bearings are recommended for OE applications. These replacement bearings are designed for aftermarket gasoline or diesel engine rebuilding—and performance engines with factory crankshafts. The bearings have an improved crankshaft finish for reducing microscopic ferrite peaks on improperly ground or polished nodular cast iron crankshafts. King SI-Series main bearings feature improved oil clearance to reduce wear and increase engine life, which in turn reduces operating noise, vibration, and excess oil flow. Order the bearing set designed for fitment on your make and model.
( 87 )
$40.99
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$43.99
On Sale
Summit Racing™ 86 Series 8mm 300 Ohm Ignition Wires
With Summit Racing™ branded, all-100 percent silicone 8mm constructed wire, a 300 ohm per foot wire-wound EMI suppression core, high-heat silicone boots, and stainless steel and brass terminals, you get all the high-end features a wire set can offer, without breaking the bank! - Dual silicone high tear-resistant jacketing with fiberglass matting gives you the highest heat protection and superior terminal pull-off values in the business - Our 300 ohm per foot wire-wound magnetic suppression core maximizes the voltage output of your ignition system, while maintaining high EMI resistance values * Stainless steel terminals with posi-lock hardened clips and brass terminals are used for superior connection and consistent voltage delivery - Ultra-high heat silicone spark plug boots provide superior radiant heat protection - High dielectric strength properties virtually eliminate voltage leakage and blow through Installing our Summit Racing™ high-end 8mm sets will give you the confidence, reliability, and performance you expect from Summit Racing™ products.
( 1023 )
$49.99
$44.99
Mahle Original Rear Main Seals
Mahle Original rear main seals are high-quality rear main seals designed to replace your factory seals. They are constructed from high-quality materials to meet or exceed OE standards and are designed to provide long-lasting durability and performance. If you're looking for high-quality replacement seals for your vehicle, Mahle Original rear main seals are your solution.
( 29 )
$31.99
McGard Wheel Locks
McGard wheel locks protect your valuable wheels and tires from theft. Having your wheels and tires stolen could leave you stranded in a bad place at the wrong time. These easy-to-use, one-piece steel wheel locks function like regular lug nuts—but require a special key tool for installation and removal. Order the size and style designed for fitment on your studs, then travel with peace of mind, courtesy of McGard wheel locks.
( 234 )
$27.99
Yukon Gear & Axle Gear Lube
Yukon Gear & Axle gear lube keeps you rolling smoothly. Choose from various products to lubricate your positraction application and combat the stress of stop-and-go driving.
( 27 )
$39.89
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$49.89
Fel-Pro Headbolt Kits
Fel-Pro headbolt kits contain a complete set of the highest quality headbolts and hardened washers available. They're cold-formed to ensure molecular integrity, then heat-treated prior to thread rolling and machining. Reduced-diameter bolt heads eliminate the need for valvetrain removal and facilitate cylinder head re-torquing. The bolts are available in a variety of head styles for fitment on specific vehicle and cylinder head applications.
( 221 )
$28.99
Sealed Power A-Series Rod Bearings
Sealed Power A-Series rod bearings can actually polish the journals on your crankshaft. That's because there's a small percentage of silicon mixed in with the aluminum and tin that make up the bearing-surface alloy. The silicon is there for wear resistance, but its toughness actually smoothes the journals of a crank with a surface that hasn't been optimized! This special surface alloy is laid over a high-strength 1010 steel backing and delivers improved seizure and corrosion resistance, as well as better wall variance control. It also helps to minimize debris embedding, which can score the crank's surface. Order the replacement bearings designed for your vehicle make and engine application.
( 33 )
$31.99
Melling Camshaft Thrust Plates
Keep your camshaft from wandering with Melling camshaft thrust plates. These solid steel plates protect your engine investment by returning your timing back to the desired specifications. Proper positioning of your camshaft is crucial. Don't let your cam walk--replace worn camshaft thrust plates with new ones from Melling.
( 38 )
$30.99
Mr. Gasket LS Thermostats
Mr. Gasket offers these high-quality thermostats for GM LS series automobile and light truck engines that utilize a separate thermostat and water neck. They're available in 160 and 180 degree temperatures to suit your engine application.
( 25 )
$37.66
Fel-Pro Valley Pan Gaskets
Fel-Pro offers valley pan gaskets in a variety of materials, port styles, and configurations. Order the model recommended for your vehicle and engine application.
( 139 )
$27.99
Summit Bucks
Moog Ball Joints
Moog has a problem-solving heritage. Their focus has always been on improving OE products, designing easy-to-install parts, and developing leading-edge technology. Moog ball joints are no exception, helping to restore your chassis to like-new condition. Performance and durability are traits required to reach the winner's circle, and Moog offers these top-quality steering linkage components for hundreds of applications--front, rear, upper, and lower. Choose the ball joints that match your drivetrain and make/model.
( 1076 )
$45.99
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$48.99
Melling Oil Pump Pickup Retainers
Melling suggests that a new properly installed oil pump pick-up tube/screen be a part of every oil pump installation. For high performance bolt-on oil pump screen applications, Melling offers additional oil pump screen support with these engine oil pump pickup tube support brackets. The lightweight billet aluminum brackets provide added support for holding the oil pump screen in place during extreme high performance engine operation. Order the replacement model recommended for your vehicle.
( 15 )
$22.99
Summit Bucks
Moog Replacement Tie Rod Ends
Moog replacement tie rod ends are designed as OE replacements for your stock units. Moog replacement tie rod ends feature durable, all-metal construction that is not prone to failure like OE plastic tie rod ends. Since Moog replacement tie rod ends are greasable (except where noted), friction is reduced and contaminants are flushed out. Plus, they have an easy-access wrench flat that allows for the use of a socket for easy installation.
( 804 )
$36.99
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$45.99
Delphi Camshaft Position Sensors
These Delphi camshaft position sensors feature a digital output design for maximum signal to noise ratio. They are not impacted by temperature changes and provide long-lasting sensor protection. These Delphi camshaft position sensors are also manufactured to meet or exceed OE requirements to ensure quality and long-lasting durability.
( 13 )
$36.99
Mahle Original Cylinder Head Gaskets
Mahle Original offers a choice of cylinder head gaskets to fit your project with the most effective, leak-free seal. Because vehicles and performance levels are as different as the people who drive them, a head gasket that works for you may not work for another. Mahle Original knows this. Their list of head gasket materials includes multi-layered steel, Solicor, VR-2000, Nitroseal, and VR500. Each does their job differently, but you can rest assured that the sealing job they do will be effective and efficient. Positive sealing is available with Mahle Original cylinder head gaskets. Order the style designed for fitment with your vehicle and engine application.
( 45 )
$47.99
TCI Governor Covers
Has your vehicle's governor cover from the factory reached its "term limit?" Might be time to choose a replacement from the experts at TCI Auto! Your old rusted and dented cover has seen years of abuse, so why let it ruin the looks of your engine bay? Now you can dress up your transmission governor with corrosion-resistant stainless steel. These aesthetically pleasing options are available in two styles—exact OEM replica or stamped with the TCI logo. Both include a rubber O-ring for a leak-free seal. Conceal the hole where the governor is located and hold it in place on the transmission with a beautiful stainless cover from TCI.
( 45 )
$40.95
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$42.95
Yukon Gear & Axle Friction Modifiers
Question: Can you run regular gear and axle oil with a limited-slip? You could answer "No" and be correct—or you could say, "Yes, but you'll need to add Yukon Gear & Axle friction modifiers." Clutch-type limited-slips can be as chatty as a room full of lawyers, and just as dangerous. When added to gear oil, this modifier helps the clutches and improves differential noise while extending life. Limited-slips have a lot of moving parts; keep them in shape with Yukon Gear & Axle friction modifiers.
( 20 )
$20.89
