Truck / SUV
Jeep®
Restoration
Stock Replacement
Late Model Muscle
Tools
Gifts, Clothing, & More
Circle Track
Street Rod
Powersports
Paint & Body
Marine
Jr Dragster
Availability
2003 GMC SIERRA 1500 HD Parts and Accessories
Showing In Stock Items. Show All 574 Items.
King XP-Series Rod Bearings
King XP-Series rod bearings feature advanced metallurgical and geometric technologies that meet extreme performance loads. They were developed for all performance applications that use forged steel aftermarket crankshafts and produce high loads for extended periods. King focuses on one product—bearings—and nothing else. Their innovative race-only Xtreme Performance Max Black Tri-Metal rod bearings have a 24 percent stronger overlay and 17 percent more fatigue strength by using a micro process called SecureBond. Built with enhanced tri-metal, King XP-Series rod bearings layer copper-lead construction with a nickel plate barrier and a lead/tin/copper Babbitt overlay over a steel backing in an adhesion process that provides superior stability and durability. King's advanced control measures hit a bull's-eye, maintaining wall thickness tolerances far tighter than their competitors—at an amazing +/- .0001 in.! XP-Series rod bearings are narrowed on the crank cheek side with increased crush height for improved bearing-to-bore contact, heat transfer, and reduced spin potential in high-rpm applications.
( 69 )
$68.99
—
$96.99
Melling Oil Pumps
Why waste time installing an old, worn-out oil pump when you can get a brand new Melling replacement oil pump at such a low cost. They're manufactured from a variety of high-quality materials with all-new components—and are individually hand-turned and pressure-tested to guarantee that they'll perform as well as OEM. These pumps are available in various styles, pressures, and volumes (some include an oil pickup). Find the model designed for fitment with your vehicle and engine.
( 322 )
$72.99
TCI Filler Tubes and Dipsticks
TCI introduces a fresh line of quality filler tubes. Applications for the most popular Ford, GM, and Chrysler transmissions are available. Most of the dipsticks feature a locking stick that satisfies sanctioning bodies' racing rules. The rubber boot seal is a vast improvement over the small O-ring typically used on older OEM tube designs.
( 188 )
$65.95
Belltech Street Performance Shocks
Belltech Street Performance twin-tube shocks set the standard in performance handling for sport trucks. Their low-speed compression characteristics help to control pitch and roll, while their progressive rebound tuning allows you to use large aftermarket wheels and still have a smooth, firm ride. Get the performance and quality that you're looking for when you order the Belltech Street Performance shock models designed for your application. Other features may include (application dependent): * Oversized galvanized steel shock bodies with steel dust covers * Sturdy 35mm valves and 15mm or 18mm piston rods * Available vehicle-specific or adjustable damping tunes * Progressive-rate polymer bump stops
( 509 )
$79.95
ACDelco Engine Oil Pressure Indicator Switches
ACDelco engine oil pressure indicator switches are quality replacement parts you can feel good about installing. They offer the fit, form, and function—along with value—you expect and want. ACDelco has a wide selection of components to optimize your GM vehicle's performance, as well as products to cover many other makes and models. Order the ACDelco oil pressure safety switch designed for your specific vehicle.
( 28 )
$50.99
King HP-Series Rod Bearings
King HP-Series rod bearings were developed mainly for drag race applications needing a material harder than the Babbitt top layer. These applications demanded a structure that could withstand high loads for short durations and still offer higher embeddability and compatibility. In response, King developed the HP-Series, featuring the Alecular metal structure. The HP-Series is also suited for many performance applications with nodular cast iron crankshafts, such as street, strip, and some levels of Circle Track racing. Order the set recommended for your vehicle. HP-Series bearings are particularly suitable for the following cases: * When a tri-metal bearing's Babbitt overlay extrudes over the sides, migrates to one end, or is physically removed by the crankshaft * When the intermediate layer of a tri-metal bearing is exposed, damaging the crank journal and requiring expensive grinding or replacement * When contaminants enter the oil stream, scratching and damaging the crankshaft journals
( 36 )
$66.99
—
$95.99
Dorman Rear Main Seal Covers
Use Dorman engine rear main seal covers to ensure the proper sealing of your engine, to stop and/or prevent engine oil leakage. They are made from high-quality materials and are available as direct replacements for a proper fit on various makes and models. Whatever your repair needs, Dorman has just what you're after!
( 10 )
$51.78
ACL Performance Race Series Rod Bearing Sets
ACL Performance offers Race Series rod bearing sets for a wide range of vehicles. These high performance tri-metal engine bearings are designed to withstand higher RPM conditions. They feature a high-strength overlay plate with reduced thickness for improved fatigue properties. Select the crankshaft undersize and quantity recommended for your year/make and engine application. Additional details: * Hardened steel backs on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing. * Increased crush for improved bearing retention * Elimination of flash plating on the back of the bearings to improve heat transfer through the bearings and to maximize the grip between the bearings and its housing * Increased eccentricity to compensate for bore distortion at high RPM and to assist in the formation of hydrodynamic oil films * 3/4 in. grooved main bearings to optimize bearing load carrying surface area and oil flow to the conrod bearings * Tight consistent wall tolerances to help you maintain consistent clearances * Enlarged ID chamfers on bearing edges (where required) to accommodate large fillet radius on performance crankshafts
( 8 )
$70.99
—
$94.99
Melling Timing Chain Sets
Melling timing chain sets are designed for use with either performance or stock cams. They have a solid-bushing chain for a true bearing surface that rolls with the sprockets, eliminating chain stretch. The crank gears are machined from stress-proof steel. Most Melling timing chain sets have three keyways to ensure accurate timing for early or late model vehicles, and to allow you to set the cam timing at 4 degrees advanced, 4 degrees retarded, or stock. However, 50-state (stock replacement) sets have single keyways. The chains are available in several styles, such as single or double roller, single non-roller, and link belt. Melling timing chain sets are not for use above 6,500 rpm. Order the model designed for your vehicle application.
( 133 )
$52.99
—
$77.99
Sealed Power MA Series Main Bearings
These Sealed Power MA Series main 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 whose surface 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 control of wall variance. It also helps to minimize debris embedding, which can score the crank's surface.
( 76 )
$89.99
Belltech Rear Shackle Kits
Belltech rear shackle and hanger kits are designed to lower the rear of your vehicle and maintain an OEM-quality ride. They are constructed from heavy-gauge, die-stamped steel to ensure a perfect fit and superior quality. All shackle kits feature a durable powdercoated finish.
( 178 )
$77.00
—
$89.00
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 )
$55.99
—
$81.99
$50.39
—
$73.79
Mahle Original Intake Manifold Gaskets
Common symptoms of poor intake manifold gasket sealing may include leaks, rough idling, and stumbling. For your next engine build, use Mahle Original intake manifold gaskets to seal your engine up tight! It's a known fact—proper sealing is vital to create maximum horsepower within the engine, and these gaskets will allow you to achieve a good, positive seal. They utilize premium materials and are precisely designed to match OE quality, fit, form, and function. Order the intake manifold gasket designed for fitment on your particular vehicle by Mahle Original, one of the most trusted names in professional sealing solutions for engines and exhaust.
( 103 )
$53.99
—
$89.99
Mahle Original Timing Cover Gaskets
No leaks, no problems! Mahle Original timing cover gaskets deliver a perfect fit for a wide range of auto, truck, van, and SUV applications. They're available in a variety of materials and configurations for specific vehicles. The gaskets feature an OE design that meets or exceeds factory specs—and are offered individually or in timing cover seal kits.
( 18 )
$61.99
Bilstein B6 4600 Series Shocks and Struts
Bilstein B6 4600 Series shocks and struts are designed to help your truck, van, or SUV reach its pinnacle in performance and handling, while still providing a comfortable, stable ride. Compared to conventional alternatives, these suspension parts offer superior control—using patented designs and dampening technology developed and tested in the real world. Order the model best suited for fitment on your vehicle.
( 1445 )
$89.00
On Sale
Mr. Gasket Water Necks
Mr. Gasket offers replacement water necks in a variety of styles, materials, finishes, sizes, and angles. Water necks help to hold the vehicle's thermostat in place as it opens and closes—to regulate the flow of coolant through your engine. The opening in the water neck created by the thermostat allows coolant to flow from the radiator back to the engine. Order the model recommended for your vehicle.
( 119 )
$51.19
—
$64.65
King HP-Series Cam Bearings
King HP-Series cam bearings are precision-machined to tight tolerances to control installed oil clearances, reducing operating bearing pressure. These cam bearings are constructed from seamless steel tubing with a thin layer of lead based babbit material to reduce microscopic deflections. The babbit is quickly cooled in the casting process to achieve a very fine grain structure, doubling tensile strength, therefore, the HP-Series offers much more fatigue strength than conventional bearings, and can withstand racing spring loads, while maintaining the excellent surface characteristics of babbit. King also offers HP-Series bearings with a fluoropolymer coating. Bearings with this coating retain engine oil on the surface, even under extreme heat and pressure—a great advantage! Plus, being a lubricant, it provides backup during start-up and in the event of momentary oil starvation. Use track-tough King HP-Series cam bearings in your engine—and experience the difference.
( 16 )
$59.99
—
$89.99
Dorman Timing Covers
Dorman timing covers are a direct replacement that matches the fit and function of the original equipment cover for a reliable repair. This part has undergone extensive testing to ensure adherence to precise design standards. Features: * Direct replacement - this engine timing cover matches the fit and function of the original equipment cover. * Durable construction - this part is specifically designed to withstand extreme underhood temperatures for a long service life. * Cost-effective solution - offers original equipment quality at a competitive price. * Quality tested - this part has undergone extensive testing to ensure a quality fit and long service life.
( 117 )
$89.95
Delphi Engine Crankshaft Position Sensors
Delphi engine crankshaft position sensors exceed OE requirements and undergo certified electrical testing. They feature enhanced sensing functionality that delivers reduced emission, improved reliability, and superior drivability. Delphi engine crankshaft position sensors are not impacted by temperature changes and provide robust, long-lasting sensor protection. Choose Delphi for the OE replacement parts that your car was born with.
( 16 )
$62.99
Standard Motor Fuel Injectors
Standard Motor Products fuel injectors help you attain maximum fuel efficiency and power from your engine. Properly operating injectors are essential components for enabling your vehicle to run flawlessly. These OEM stock replacements are available for hundreds of specific applications. Don't drive with faulty fuel delivery. Update worn or malfunctioning fuel injectors with reliable models from Standard Motor Products.
( 252 )
$77.99
Clevite AL-Series Main Bearings
For some engines, the softer and more conformable nature of aluminum is preferable to the stiffer characteristics of the steel backings used for many bearings. Clevite AL-Series main bearings offer the features found in OE-type aluminum bearings, combined with the distinct advantages of proven Clevite know-how. That includes things such as carefully chosen eccentricities tailored to the application, and that means solid, reliable performance. Clevite AL-Series main bearings are a great choice for anything from OEM-style rebuilds to mild performance applications. Clevite recommends these main bearings for most engines using a cast crankshaft.
( 10 )
$56.99
—
$61.99
ICT Billet Fuel Injector Spacers
ICT fuel injector spacers adapt shorter LS injectors into taller LS intake manifolds and fuel rails. Manufactured from aerospace-grade billet aluminum, the spacers are available in multiple choices to add length to your fuel injectors. ICT Billet spacer sets also include O-rings. Choose the parts designed for your specific application.
( 28 )
$58.99
Fel-Pro PermaDryPlus Intake Manifold Gaskets
Demanding conditions call for Fel-Pro PermaDryPlus intake manifold gaskets. Chemicals, vibration, and the harsh operating environments of your engine present a challenge to your intake gaskets. PermaDryPlus gaskets stand up to daring stress and solve troublesome sealing situations. Fel-Pro intake gaskets feature aluminized steel carriers, fluoroelastomeric coatings, and strategically placed sealing beads, locating tabs, and self-centering torque limiters. These features provide premium sealing results that are impervious to all types of coolants and oils. Order the replacement gasket set recommended for your vehicle and engine application.
( 80 )
$73.99
Belltech Nitro Drop 2 Shocks
Featuring a completely new design, Belltech Nitro Drop 2 shocks bring a high performance blend of internal valve technology and state-of-the-art construction to your vehicle. They feature a cavitation-free valve assembly that prevents air from decreasing the shocks' effectiveness. These Belltech Nitro Drop 2 shocks include dust boots and have OEM-style rubber bushings to offer a smooth, comfortable ride.
( 343 )
$65.00
