2003 Workhorse W20 Car Parts & Accessories
You have come to the right place if you need new or replacement parts for your 2003 W20. Advance Auto carries over 84 aftermarket parts for your 2003 Workhorse W20, along with original equipment manufacturer (OEM) parts. You will find amazing prices on 2003 W20 Transmission Parts and Engine Parts. Plus, our selection of 2003 Performance and Racing Products for your W20 are some of the lowest in the market.
Find replacement parts and upgrades for your 2003 Workhorse W20. Use our customer reviews of Exhaust Parts parts and others, along with user ratings on the many of the products we offer. You won’t find an easier way to shop for 2003 Workhorse W20 performance parts, 2003 Workhorse W20 body parts, interior components, or any type of part for that matter. Get your W20 upgraded or back in pristine shape by shopping Advance Auto Parts.
Find 2003 Workhorse W20 Parts by Category
Top Workhorse Part Categories
2003 Workhorse W20 Performance and Racing Products
Below you can find the top 2003 Workhorse W20 aftermarket accessories. Want to see the complete catalog of Performance and Racing Products? Click on “View All” to view each individual Workhorse 2003 W20 part.
K&N – Premium Oil Filter: Ideal for Synthetic & Conventional Oil, Protects Your Engine (Part No.HP-2002)
from
$17.99
K&N premium oil filters are meticulously engineered to offer outstanding filtration and engine protection. The heavy-duty canister is engineered to be exceptionally durable, and a one-inch welded hex nut can be used for quick and easy filter removal. Each filter is specifically designed to withstand the service intervals recommended by vehicle manufacturers.
See More
2003 W20 Transmission Parts
Customers frequently purchase these best-selling 2003 Workhorse W20 Transmission Parts.
Dorman – EZ Drain Engine Oil Drain Plug: M12-1.75 Thread, 21 mm Head, 1 Pack (Part No.092-018)
from
$16.99
Ditch the wrenches and rags and get this Dorman Twist Drain oil drain plug. It’s specially designed to simplify changing your oil by replacing your factory plug with a tool-free, clean and easy solution. Just push, twist and drain. It also features a custom tapered O-ring that ensures a leak-proof seal, and is finished with electrophoresis and anodization for rust resistance. Every Dorman part is backed by over 100 years of experience, along with a dedicated team of product experts, automotive engineers and technical support specialists based in the United States. We are passionate about giving repair professionals and vehicle owners greater freedom to fix cars and trucks, which is why we have more than 100,000 parts in our catalog today and promise to never stop driving new solutions.
Product Features:
See More
Product Features:
- Simplifies service – this trademark Dorman Twist Drain plug replaces the original equipment oil drain plug and allows for cleaner and easier oil changes
- Tool-free solution – eliminates need for wrench to drain oil pan; simply push, twist and drain
- Leak resistant – proprietary inner seal handles high pressure and temperature to prevent leaks
- Corrosion resistant – specially coated to avoid rust for a long service life
Dorman – Transmission Connector for 5/8 In. Tube 7/8-14 UNF (Part No.800-613)
from
$24.49
Made of quality materials, this automatic transmission oil cooler line connector matches the fit and function of a damaged original equipment connector to restore leak-free performance between the transmission and the oil cooler.
Product Features:
See More
Product Features:
- Quality replacement – this transmission cooler connector matches the fit and function of the original equipment connector
- Durable construction – this oil cooler line connector is made of quality materials for a precise fit and leak-free durability
- Performance tested – this connector has been rigorously pressure tested to ensure reliable performance
- Ideal shop supply – this connector is recommended to have on hand any time service is being performed on the transmission oil cooler line
Premium Drive Train – Automatic Transmission Assembly (Part No.T4L80E810117W)
from
$2534.99
(PDT)Premium Drivetrain Transmissions are remanufactured to original equipment (OEM) demanding specifications by an OEM builder. Each transmission assembly is manufactured with the highest technology equipment, the most intelligent engineering support, and the best practices available in remanufacturing today.
Product Features:
See More
Product Features:
- All transmissions are completely disassembled and cleaned. All cases are media blasted. Internal parts are inspected for wear or damage and replaced as required. All bushings are inspected and replaced as required.
- 100% of friction components are replaced with upgraded heavy duty parts.
- Drum assemblies are air checked and side play is checked to assure proper clearance. 100% of seals, o’rings and gaskets are replaced.
- 100% of solenoids are checked and replaced if they do not pass duty cycle tests. Internal wiring harness are checked and replaced as necessary. Valve bodies are disassembled, cleaned, and measured for wear. Valve body valves and valve bores are inspected and valve bores are machined as required. Completed valve bodies are tested for proper operation prior to dyno testing.
- Transmissions are assembled, end plays are set and fasteners are torqued to the required specification.
- Torque Converter: 100% of converters are dynamic balanced. 100% of pumps are furnaced brazed. 100% new bearings and o’rings. 100% new springs and rollers in stator. 100% new thrust washers. 100% new friction liners in overdrive lockup converters.
- 100% of transmissions are dynamometer tested to ensure proper pressures and shift quality throughout the operating range. All upshifts and downshifts are checked against preset parameters. Torque converter stall speed and lockup is verified on the dyno
Premium Drive Train – Automatic Transmission Assembly (Part No.T4L80E8101W)
from
$2534.99
(PDT)Premium Drivetrain Transmissions are remanufactured to original equipment (OEM) demanding specifications by an OEM builder. Each transmission assembly is manufactured with the highest technology equipment, the most intelligent engineering support, and the best practices available in remanufacturing today.
Product Features:
See More
Product Features:
- All transmissions are completely disassembled and cleaned. All cases are media blasted. Internal parts are inspected for wear or damage and replaced as required. All bushings are inspected and replaced as required.
- 100% of friction components are replaced with upgraded heavy duty parts.
- Drum assemblies are air checked and side play is checked to assure proper clearance. 100% of seals, o’rings and gaskets are replaced.
- 100% of solenoids are checked and replaced if they do not pass duty cycle tests. Internal wiring harness are checked and replaced as necessary. Valve bodies are disassembled, cleaned, and measured for wear. Valve body valves and valve bores are inspected and valve bores are machined as required. Completed valve bodies are tested for proper operation prior to dyno testing.
- Transmissions are assembled, end plays are set and fasteners are torqued to the required specification.
- Torque Converter: 100% of converters are dynamic balanced. 100% of pumps are furnaced brazed. 100% new bearings and o’rings. 100% new springs and rollers in stator. 100% new thrust washers. 100% new friction liners in overdrive lockup converters.
- 100% of transmissions are dynamometer tested to ensure proper pressures and shift quality throughout the operating range. All upshifts and downshifts are checked against preset parameters. Torque converter stall speed and lockup is verified on the dyno
Dorman – HD Solutions – Transmission Fitting (Part No.800-5603)
from
$62.99
Made of quality materials, this automatic transmission oil cooler line connector matches the fit and function of a damaged original equipment connector to restore leak-free performance between the transmission and the oil cooler.
Product Features:
See More
Product Features:
- Quality replacement – this transmission cooler connector matches the fit and function of the original equipment connector
- Durable construction – this oil cooler line connector is made of quality materials for a precise fit and leak-free durability
- Performance tested – this connector has been rigorously pressure tested to ensure reliable performance
- Ideal shop supply – this connector is recommended to have on hand any time service is being performed on the transmission oil cooler line
Dorman – 4 Wire Multipurpose Connector (Part No.645-578)
from
$62.99
This neutral safety switch connector is designed to match the appearance and function of the original hardware on specified applications. Made of quality materials, it is engineered for reliable performance and durability.
Product Features:
See More
Product Features:
- Direct replacement – this neutral safety switch connector matches the appearance and function of the factory hardware on specified applications
- Ideal solution – this connector is a reliable replacement for an original part that is missing or has failed due to fatigue
- Durable construction – this part is made from quality materials to ensure reliable performance and long service life
- Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
Dorman – Transmission Fitting (Part No.800-728)
from
$22.99
Made of quality materials, this automatic transmission oil cooler line connector matches the fit and function of a damaged original equipment connector to restore leak-free performance between the transmission and the oil cooler.
Product Features:
See More
Product Features:
- Quality replacement – this transmission cooler connector matches the fit and function of the original equipment connector
- Durable construction – this oil cooler line connector is made of quality materials for a precise fit and leak-free durability
- Performance tested – this connector has been rigorously pressure tested to ensure reliable performance
- Ideal shop supply – this connector is recommended to have on hand any time service is being performed on the transmission oil cooler line
2003 W20 Engine Parts
No need for it to be difficult to find Engine Parts for your 2003 Workhorse W20. Compare prices, read reviews, and buy your W20 Engine Parts online for delivery or in-store pick up.
Dorman – Help – Engine Oil Fill Cap (Part No.80987)
from
$13.99
This engine oil filter cap is designed to match the fit and function of the original cap on specified vehicles, and is engineered for durability and reliable performance.
Product Features:
See More
Product Features:
- Direct replacement – this engine oil filter cap is designed to match the fit and function of the original cap on specified vehicles
- Restores functionality – reliable replacement for an original part that is missing or cracked due to heat and fatigue
- Durable construction – this part is made from quality materials to ensure reliable performance and long service life
- Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
Dorman – Help – Engine Oil Filler Cap (Part No.42315)
from
$13.99
This engine oil filter cap is designed to match the fit and function of the original cap on specified vehicles, and is engineered for durability and reliable performance.
Product Features:
See More
Product Features:
- Direct replacement – this engine oil filter cap is designed to match the fit and function of the original cap on specified vehicles
- Restores functionality – reliable replacement for an original part that is missing or cracked due to heat and fatigue
- Durable construction – this part is made from quality materials to ensure reliable performance and long service life
- Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
Dorman – HD Solutions – Oil Cooler Line Connector (Part No.800-5602)
from
$39.49
This engine oil cooler line connector is designed to match the appearance and function of the original hardware on specified applications. Made of quality materials, it is engineered for reliable performance and durability.
Product Features:
See More
Product Features:
- Direct replacement – this engine oil cooler line connector matches the appearance and function of the factory hardware on specified applications
- Ideal solution – this connector is a reliable replacement for an original part that is missing or has failed due to fatigue
- Durable construction – this part is made from quality materials to ensure reliable performance and long service life
- Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
Spartan – Engine Long Block; Chev 8.1/496 02-03 Engine (Part No.DCWC)
from
$3944.99
Remanufactured Engines are fully disassembled; heads, blocks, cranks & cams are machined & wear parts are replaced. Each engine is individually tested after assembly to assure compression, oil pressure and water jacket integrity.
Product Features:
See More
Product Features:
- Each engine we remanufacture is essentially reverse engineered – in part to discover original factory deficiencies. If possible, our seasoned R&D personnel & QC experts make improvements. Why shouldn’t our engine last longer than your first?
- Engines come with installation gasket set & oil pump unless noted otherwise. If we have important installation information it will be included on tags or in the paperwork packaged with your engine.
- Engines are securely packaged in a recyclable container that will also protect your core on the return trip. Our nationwide warehouse network means speedy delivery.
- Each engine is remanufactured with quality OE level components not “white” box generic parts that may or may not satisfy your needs and expectations. When you use the best you get the best results and satisfaction.
Spartan – Engine Cylinder Head; Chev 8.1/496 01-06 LFT Head (Part No.2CW2L)
from
$619.99
Remanufactured Cylinder Heads are complete rebuild & include new valve stem seals, soft plugs & verified camshafts. All threads are checked and repaired if necessary. Cylinder Heads are packaged in heavy plastic to protect the unit.
Product Features:
See More
Product Features:
- All cylinder heads are both vacuum and pressure tested to verify valve seating, & integrity of water passages.
- All cylinder heads are packaged in environmentally safe and recyclable containers that are the perfect size for returning your original core
- All threads and machined surfaces are and repaired with technology that exceeds the original metal
- Non-sealing iron surfaces painted to prevent oxidization
Spartan – Engine Cylinder Head; Chev 8.1/496 01-06 RGT Head (Part No.2CW2R)
from
$619.99
Remanufactured Cylinder Heads are complete rebuild & include new valve stem seals, soft plugs & verified camshafts. All threads are checked and repaired if necessary. Cylinder Heads are packaged in heavy plastic to protect the unit.
Product Features:
See More
Product Features:
- All cylinder heads are both vacuum and pressure tested to verify valve seating, & integrity of water passages.
- All cylinder heads are packaged in environmentally safe and recyclable containers that are the perfect size for returning your original core
- All threads and machined surfaces are and repaired with technology that exceeds the original metal
- Non-sealing iron surfaces painted to prevent oxidization
Dorman – Oil Cooler Line Connector (Part No.800-712)
from
$11.29
This engine oil cooler line connector is designed to match the appearance and function of the original hardware on specified applications. Made of quality materials, it is engineered for reliable performance and durability.
Product Features:
See More
Product Features:
- Direct replacement – this engine oil cooler line connector matches the appearance and function of the factory hardware on specified applications
- Ideal solution – this connector is a reliable replacement for an original part that is missing or has failed due to fatigue
- Durable construction – this part is made from quality materials to ensure reliable performance and long service life
- Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
Dorman – Steel Cup Expansion Plug 2-7/31 In. SC, Height 0.260 (sold by each) (Part No.555-081)
from
$2.29
This engine camshaft plug is designed to match the fit and function of the original part on specified vehicles. Made of quality materials, it is engineered for reliable performance.
Product Features:
See More
Product Features:
- Direct replacement – this engine camshaft plug matches the fit and function of the factory part on specified years, makes and models
- Ideal solution – this plug is a reliable replacement for an original part that is missing or has failed due to fatigue
- Durable construction – this part is made from quality materials to ensure reliable performance and long service life
- Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
2003 W20 Exhaust Parts
Customers frequently purchased the following top Exhaust Parts for their 2003 W20. Click on “View All” to see more great prices on 2003 W20 aftermarket replacement Exhaust Parts.
Dorman – Help – Exhaust Stud Kit – M10-1.5 x 62mm (Part No.03133)
from
$17.29
Our exhaust manifold flange kit includes all necessary studs and nuts for a complete repair.
Product Features:
See More
Product Features:
- Direct replacement for a proper fit every time
- Durable steel construction
- New hardware helps fix exhaust leaks
- Also available in the Exhaust Manifold Hardware Kit
Taylor Gaskets – Vibe Lock Header Bolt Kit (Part No.310070)
from
$85.99
Vibe Lock Header Bolt Kit
Dorman – Help – Exhaust Flange Stud Kit – M10-1.5 x 62mm Stainless Steel (Part No.03133HP)
from
$26.99
This exhaust flange stud and nut are designed to match the fit and function of the original hardware on specified vehicles. Made of quality materials, this hardware is engineered for reliable performance.
Product Features:
See More
Product Features:
- Upgraded hardware – this set of six M10-1.5 exhaust manifold mounting studs and nuts are 100 percent stainless steel for superior heat and corrosion resistance
- Convenient solution – kit contains all the application-specific hardware necessary to join one exhaust manifold to one manifold flange
- Matches fit – this hardware matches the fit and function of the factory fasteners, while offering superior durability
- Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
Dorman – Help – Exhaust Manifold Hardware Kit (Part No.32121)
from
$25.99
This exhaust manifold hardware kit matches the original hardware required to secure the exhaust manifold to the engine on specified vehicles, and is made from quality materials for reliable performance.
Product Features:
See More
Product Features:
- Direct replacement – this exhaust manifold hardware kit matches the original hardware required to secure the exhaust manifold to the engine on specified vehicles
- Ideal solution – this kit is a reliable replacement for the original hardware that is missing or damaged, or has failed
- Durable construction – this kit is made from quality components to ensure reliable performance and a long service life
- Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
2003 W20 Electrical Parts
Carquest Premium – Ignition Coil Connector (Part No.PTA1397)
from
$37.99
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
Product Features:
See More
Product Features:
- Premium quality materials for longer service life
- Sealed connections (where applicable) to prevent environmental corrosion and performance issues
- Global coverage for import and/or domestic applications
- OE specified wire gauge to ensure a reliable electrical connection
- Designed to meet or exceed OE specifications in form, fit and function
