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2003 GMC SIERRA 1500 HD Parts and Accessories
Showing In Stock Items. Show All 51 Items.
Summit Racing™ Ring and Pinion and Differential Pro Packs
Put that horsepower to the ground through both wheels. These Summit Racing™ ring and pinion and differential Pro Packs feature the parts necessary to complete your rear differential transformation. They include a Traction-Lock differential from Ford Racing, a ring and pinion gear set, a ring and pinion installation kit, a 4 oz. bottle of friction modifier, and 2 qt. of 75W90 gear lube. These Summit Racing™ ring and pinion and differential Pro Packs come available in different gear ratios, so we are sure to have one to suit your vehicle's needs.
( 3 )
$1,005.97
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$1,021.97
PowerStop Z36 Truck and Tow Brake Upgrade Kits with Calipers
PowerStop is on a mission to deliver an easy and affordable way for any driver to upgrade their brakes--no matter where or how they use their vehicle. PowerStop Z36 Truck and Tow brake upgrade kits with calipers are recommended for trucks, 4x4s, and SUVs that not only work hard, but play hard as well. These brake pad, rotor, and caliper kits come with everything you need, including premium stainless steel hardware, for an easy, bolt-on installation. PowerStop's Z36 Extreme low-dust ceramic brake pads are reinforced with carbon fiber to provide severe-duty stopping power without sacrificing everyday drivability. They are paired with drilled, slotted, and zinc plated rotors that keep brake temperatures down by maximizing heat dissipation, critical for those long mountain descents. The bright red powdercoated calipers are not only protected against corrosion, but also stand out behind your wheels. Whether towing a boat or trailer, hauling for the jobsite, or tackling a tough off-road trail, choose easy and affordable, bolt-on performance upgrades—PowerStop Z36 Truck and Tow caliper brake kits.
( 555 )
$1,138.16
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$1,176.60
Go Rhino Bed Bars
Rhino bed bars from Go Rhino will add intimidating off-road style to your pickup. Constructed from 3 in. diameter steel tubing, these bed bars stand tough—and they come in a black powdercoat, chrome, or polished stainless finish to trick out any truck. Go Rhino bed bars feature a complete bolt-together design with no exposed welds or mounting hardware and also include hard plastic gaskets to eliminate any metal-to-metal contact. Choose your bed bars in single, double, or triple-bar style to get the right look for your truck. For even more utility, add an optional light bar and lights (sold separately) to your Go Rhino bed bars!
( 5 )
$1,109.99
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$1,399.99
Auburn Gear Select-A-Loc Differentials
Auburn Gear Select-A-Loc differentials maximize your vehicle's traction with on-the-go system engage. These electronically controlled traction-enhancing differentials are selectable lockers offering the traction control of a limited-slip differential and a full-locking differential--all in one! When locker switch is off, the clutch pack activates the limited-slip mode. As torque increases, the separating forces within the differential gears increase, causing the clutch pack to be compressed, in turn providing bias torque to the highest traction wheel. When the locker switch is turned on, electronic current is sent to the electromagnetic coil which locks the axles together. Auburn Gear Select-A-Loc lockers feature a unique cone-clutch design with gearing made from aircraft-quality 9310 heat-treated billet steel for tough-as-nails strength. The lockers operate quietly without any shift fork or pins to line up to change the locker mode. With a limited-slip mode for on/off-road excitement and a true locker mode for the quarter-mile or nasty off-road terrain, Auburn Gear Select-A-Loc differentials deliver superior traction capabilities on the street, at the track, or off-road.
( 10 )
$1,225.99
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$1,324.99
Dee Zee Liquid Transfer Tanks
Perfect for long hauls or remote refuels, Dee Zee liquid transfer tanks can raise your hauling capacity significantly. They are available in models with various volumes and features to fit almost any truck bed application. While most of these auxiliary tanks are not rated for gasoline or flammable fluid transport, many can be used for diesel or other non-flammable fluids. Find the right size, capacity, tank material, and finish for your application—and get your truck outfitted with a Dee Zee liquid transfer tank today.
( 1 )
$1,000.99
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$1,183.99
Rough Country N3 Suspension Lift Kits
Rough Country offers N3 Series suspension lift kits for thousands of trucks from the late 1960s and up—including models from Chevrolet, GMC, Cadillac, Dodge, RAM, Ford, Jeep, Toyota, Nissan, and Mazda. Depending on the application, these kits enable you to raise the front and/or rear of your vehicle anywhere from 1.5 in. to 7.5 in. This is accomplished via a variety of lift component options, such as steering knuckles, torsion bar keys, spacers, strut kits, A-arm brackets, coil springs, leaf springs/blocks, upper control arms, Add-a-Leaf, and shackles. Suspension lift kits provide many benefits, including an aggressive stance, a clean level look, increased ground clearance, and plenty of ride height to accommodate larger tires. Rough Country kits feature front and/or rear N3 nitrogen-charged shocks for incredible ride quality on- and off-road. Most kits are 100 percent bolt-on, requiring no cutting, drilling, or welding. Enhance your rig with all-new stature; order the lift kit recommended for your truck!
( 15 )
$1,049.95
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$1,299.95
SSBC-USA Tri-Power HD Quick-Change Caliper Upgrade Kits
SSBC-USA Tri-Power HD Quick-Change caliper upgrade kits are your key to heavy-duty braking performance. Designed to bolt to your stock spindles and reuse the stock cradle brackets, these calipers offer maximum clamping force and even pressure distribution across the brake pad. The kits include Tri-Power HD 3-piston aluminum calipers, high performance pads, and all necessary mounting hardware. They're available for hundreds of applications from 1999 and up.
( 1 )
$1,111.00
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$1,206.00
BakFlip G2 Tonneau Covers by BAK
Keep your cargo protected from the elements—and thieves! BAK BakFlip G2 tonneau covers combine the convenience of a folding design with hard tonneau security and durability. You can fold the BakFlip G2 back for complete truck bed access or fold it down and lock it in place to protect your valuable cargo. Its aluminum panels won't shrink or stretch during weather changes and are capable of holding up to 300 pounds of evenly distributed weight. Features include: • Sleek, low-profile fit • Aluminum panels resist changes in weather • Treated to resist the harmful effects of UV rays—no cracking or warping • Innovative locking arms secure the cover when its folded against your rear window • Tongue and groove weatherstripping keeps rain and snow out • No-drill installation
( 28 )
$1,049.99
Eaton Detroit Lockers
Eaton Detroit lockers are designed to maximize traction by delivering 100 percent of the torque and power to both drive wheels. They are engineered to keep both wheels in a constant drive mode and have the ability to automatically allow wheel speed differentiation when required.
( 80 )
$1,198.99
MaxTrac Suspension Lowering Kits
MaxTrac Suspension lowering kits can deliver a new stance and a new attitude for your truck. The kits offer an easy and quick way to lower the rear of your truck, so that every turn of the wheel will feel more responsive and commanding. All the components are there—flip kit, C-frame support, shock angle corrector, and shocks (kits may differ slightly in components). Bring your ride closer to the ground with the high-quality parts provided with MaxTrac lowering kits, available for hundreds of applications from 1965 and up.
( 11 )
$1,103.74
Hays Twister Full Race Torque Converters
Hays Twister Full Race Torque Converters feature a custom-designed anti-balloon plate to stop any converter ballooning and swelling in racing situations. These torque converters are designed for use with a trans-brake and great for power adders such as nitrous, superchargers, and turbos. They're available with various RPM stall speed offerings to accommodate any mixture of modifications—including higher compression ratios, aftermarket camshafts, aftermarket cylinder heads, lower gear ratios, and vehicle weight loss. Additional product features: * All Full Race Series converters are built, tested, and proven to support up to 1,000 hp * Designed to handle the extreme shock and abuse of trans-brakes, nitrous oxide, superchargers, and turbochargers * State-of-the-art spray welding process is used in select areas. Spray welding provides clean, strong, and consistent fusion while also increasing strength through hardening from higher process temperature * Each converter is hand-built and inspected in every step of assembly to ensure top-of-the-line quality * All Hays torque converters are internally welded, compared to brazing. Testing has shown welding provides longer converter life while also enhancing consistency * Heavy-duty Torrington bearings are used for greater strength and durability * Stators are chosen with high-flow vents and channels to promote cooling in heat-producing higher horsepower applications * Increased horsepower and acceleration due to a weight-saving, one-application design. Almost all Hays converters are built for one application to reduce weight, compared to a multi-bolt pattern converter * Full Race Series torque converters are offered in several different stall speeds for popular automatic transmissions.
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$1,299.95
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$1,449.95
Dorman Driveshafts
Dorman driveshafts are designed to replace your factory originals with no modifications. They are manufactured from quality materials and have the stock connections for an easy bolt-in fit. The driveshafts are available in various lengths, diameters, and materials for many auto, truck, and SUV applications.
( 323 )
$1,109.95
Kleinn The Beast Triple Train Horn Spare Tire Kits
Kleinn's The Beast triple train horn universal spare tire kit was designed for lifted trucks with oversize tires and a useless spare under the bed. The triple train horns, air compressor, and 3-gallon air tank all mount on a custom engineered bracket that is suspended by the OEM spare tire winch. The system will easily inflate 37 in. tires, power air tools, air suspension, and honk your Kleinn train horns in an incredibly loud way. Additional details: * Heavy-duty build * Powdercoated custom mounting brackets * 3-gallon air tank with Cortec interior anti-corrosion coating * Tire Inflator with 30 ft. hose, remote quick-connect, and storage bag
Not Yet Reviewed
$1,089.95
Nitrous Express 4-Bolt Plate Nitrous Systems for GM LS Engine
Nitrous Express 4-bolt plate systems for GM LS-style engines feature a billet 90mm or 102mm nitrous plate that installs between the throttle body and intake manifold, making installation quick, easy, and attractive. Power levels can be adjusted between 50, 100, 150, 200, 250, 300, 350 and 400 horsepower. The systems are pre-machined with a second set of nitrous and fuel passages so you can easily upgrade to a dual stage system down the road. (Special note: These kits will work on 2010 and newer Camaros if you rotate the throttle body 180 degrees.) Order the model best suited for your setup. Systems include: * 90 or 102mm nitrous plate * Choice of no bottle, 5 lb., 10 lb., 12 lb., or 15 lb. bottle * Stainless bottle brackets (except no bottle system) * ProPower Lightning Series solenoids * 6 AN feed line * Braided stainless steel solenoid to plate lines * Master arming switch * WOT switch * Every nut, bolt, and electrical connector needed to complete installation
( 3 )
$1,040.21
Hays Twister 3/4 Race Torque Converters
Hays Twister 3/4 Race performance torque converters are designed to be the perfect solution for your street/strip machine. Hays designed the Twister torque converters to be one step short of being a "Full Race" converter giving you the perfect combination of performance and affordability. Every torque converter is hand built, inspected and tested to ensure they meet the top of the line quality you expect. To ensure consistency and improve performance each converter is built for one transmission with one bolt pattern, meaning a lighter converter to maximize performance. High flow stators promote better cooling and heavy duty Torrington bearings are used to increase strength and durability. Not ready to go a "Full Race" converter, Hays is there for you with their Twister 3/4 Race torque converters.
( 11 )
$1,024.95
Dee Zee Platinum Series Truck Bed Toolboxes
Dee Zee's Platinum Series truck bed toolboxes are loaded with features to suit your storage needs. They include exclusive latches that offer trouble-free opening and closing, along with gas shocks that open at a steady, controlled rate to prevent damage to the truck's cab. A rubber bulb seal prevents water from entering the toolboxes. Dee Zee Platinum Series toolboxes are constructed from heavy-duty aluminum with a textured black powdercoat that will never rust. These boxes have lockable handles for security and a removable tool tray to keep your items organized. They're available for fitment in more than 1,600 truck applications from the 1970s and up.
Not Yet Reviewed
$1,276.99
Nitrous Outlet Nitrous Oxide Plate Systems
Nitrous Outlet nitrous oxide plate systems come out of the box ready to deliver superior atomization. They spray up to 200 hp, but are capable of flowing up to 400 hp with additional jetting and a -6 AN main feed line upgrade. You'll get race-proven performance from the unique 6-port discharge design, guaranteeing the perfect mixture of fuel to nitrous. Overview: * Max flow 400 hp * 400+ hp solenoids * Anodized black aluminum plate and bottle (if included) * Wide-open throttle activation switch * Hardware, electric, and jetting included * E85 compatible with different jetting * Jetting included for 50 to 200 hp
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$1,018.99
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$1,298.99
PowerStop Z23 Evolution Sport Brake Upgrade Kits with Calipers
PowerStop is on a mission to deliver an easy and affordable way for any driver to upgrade their brakes--no matter where or how they use their vehicle. Forget standard, off-the-shelf parts. PowerStop's Z23 Evolution Sport brake upgrade kits with calipers comes with everything you need--pads, rotors, calipers, and premium stainless steel hardware for an easy, bolt-on upgrade for your daily driver. Along with increased braking power, the carbon fiber ceramic brake pads feature a low-dust formula to keep those wheels looking great while you say goodbye to nasty brake dust. These pads combine with drilled, slotted, and zinc plated rotors to ensure a cool, smooth ride that protects against rust and corrosion, while the powdercoated calipers not only protect against corrosion, but also stand out behind your wheels. Give your daily driver the easy and affordable performance upgrade it deserves--PowerStop Z23 Evolution Sport caliper brake kits.
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$1,064.20
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$1,099.72
B&M Holeshot Torque Converters
A higher-than-stock stall speed as delivered by these B&M Holeshot converters will provide several advantages and benefits to vehicles with modified engines. Many modifications, particularly big cams, tend to reduce low-end power and torque. These high-stall converters allow the engine to launch the car at higher rpm, where more torque is available. They're a very good choice for the typical street machine that is looking for better launch capability and more strength.
( 84 )
$1,075.95
Dee Zee Transfer Tanks
Dee Zee transfer tanks offer room for liquid and allow plenty of extra room in your truck bed! The tanks feature a radius curve design that eliminates key weld pressure points; they include a cap, a coupler for venting, and three stability baffles to prevent sloshing and dangerous weight transfer. Choose the size and tank capacity tailored for your make/model—then conserve space while transporting liquids you need with Dee Zee transfer tanks.
Not Yet Reviewed
$1,006.99
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$1,322.99
On Sale
WeatherTech AlloyCover Tonneau Covers
The WeatherTech AlloyCovers are a lightweight foldable hard tonneau cover for those looking to maximize security and durability without compromising style and aerodynamics. These low-profile hard truck bed covers feature an easy-to-use tri-fold design, which makes for effortless installation and removal. The AlloyCovers also feature the AutoLatch II latching system that when paired with a locked tailgate provides excellent security. The truck bed covers sit less than half an inch above the truck bed and incorporates a water-shedding design and vinyl coated hinges to route water away from the bed without gutters or drains. Order the model designed for your application.
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$1,113.95
$1,002.56
Innovators West Drive Pulley Conversion Kits
Innovators West drive pulley conversion kits upgrade your vehicle to an 8-rib or 10-rib drive with standard balancer—or you can switch to a 10 percent overdrive balancer. Yes, that's correct. Each Innovators West conversion kit delivers not only the pulleys, but also an SFI 18.1 stickered and stamped harmonic balancer. Your Innovators West drive pulley conversion kits may include: * Crankshaft balancer—SFI 18.1 standard or 10 percent overdrive * Power steering pulley (not included with EPS conversions) * Alternator pulley * Smooth idler pulley * Ribbed idler pulleys (included only with EPS conversions) * Ribbed tensioner pulley * Water pump pulley (10-rib conversions only)
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$1,148.85
Access LoMax Professional Series Hard Tri-Fold Tonneau Covers
LoMax just got stronger with the quality you expect and durability you require. These LoMax professional series hard tri-fold tonneau covers build on the performance of the original LoMax by adding extruded aluminum channels and aluminum diamond plate panels for that extra strength and durability that the jobsite demands. Whether on the clock or off, LoMax Professional Series works as hard as you do.
Not Yet Reviewed
$1,442.70
Access LoMax Stance Hard Covers
Access LoMax Stance hard tonneau covers are raising travel standards. They enable you to conveniently transport large cargo by placing the cover in the vertical position for full bed usage—or keep it closed for better gas mileage. Black urethane painted aluminum panels, waterproof seals, and durable hinges protect your gear from rain and dust. Standout style and quality craftsmanship set the LoMax Stance hard covers apart. Installation is easy to do by yourself; no need for complicated tools or equipment. Rooftop anchors and powdercoated steel pivot links with rubber bushings reduce noise and prevent the covers from contacting the rear window when stored vertically behind the cab. Dozens of models are available for specific vehicle applications.
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$1,378.80
