2003 Peterbilt 378 Engine
Select Your Submodel
- Engine Blocks
- Valves & Valvetrain Parts
- Pistons, Rings & Connecting Rods
- Oil Filters
- Serpentine Belts & Auxiliary Drive Belts
- Valve Covers
- Timing Gears, Chains & Covers
- Oil Pans, Drain Plugs & Dipsticks
- Cylinder Heads
- Engine Pulleys
- Engine Sensors, Relays, Switches
- Oil Pumps
- Oil Coolers
- Camshafts
- Crankshafts
- Engine Management Systems
- Engine Bearings
- Engine Rebuild Kits
- Intercoolers
- Throttle Bodies
- Motor Oils
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Baldwin Filters®Engine Oil FilterPeterbilt 378 2003, Engine Oil Filter by Baldwin Filters®. Dirty oil can cause catastrophic damage to your engine. By using the proper lube filter for your engine, you can minimize the possibility of costly downtime and repairs. Baldwin...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$22.16 - $74.11 - PAI®Engine Gasket KitPeterbilt 378 2003, Engine Gasket Kit by PAI®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Perfect blend of leading innovations and superior workmanshipManufactured to offer high value and everlasting reliability$12.16 - $4,491.75
- PAI®Mounting GasketPeterbilt 378 14.9L 2003, Mounting Gasket by PAI®. Sold Individually. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....2 Years WarrantyPerfect blend of leading innovations and superior workmanship$11.48
- PAI®Piston Ring KitPeterbilt 378 2003, Piston Ring Kit by PAI®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Perfect blend of leading innovations and superior workmanshipManufactured to offer high value and everlasting reliability$88.10 - $121.72
- PAI®Engine Oil DipstickPeterbilt 378 12.7L 2003, Engine Oil Dipstick by PAI®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured...Perfect blend of leading innovations and superior workmanshipManufactured to offer high value and everlasting reliability$31.77
- Gates®Micro-V™ V-Ribbed BeltPeterbilt 378 L6 10.3L / 12.0L 2003, Micro-V™ V-Ribbed Belt by Gates®. Length: 74.66". Gates is the largest global manufacturer of OE timing belts. This means Gates is able to cover the Aftermarket with timing belts that are...Special belt construction eliminates belt noise, reduces tension loss, and solves problem drive applicationsUtilizes advanced materials like Aramid Fiber found in bullet-proof vests and crack and heat-resistant EPDM materials$39.19
- Gates®FleetRunner™ Heavy Duty V-BeltPeterbilt 378 L6 10.3L / 12.0L with A/C 2003, FleetRunner™ Heavy Duty V-Belt by Gates®. Length: 46". Gates is the largest global manufacturer of OE timing belts. This means Gates is able to cover the Aftermarket with timing belts that...The finest quality at a great priceGates carries everything needed to complete the job$24.40
- Gates®DriveAlign™ Drive Belt Idler PulleyPeterbilt 378 2003, DriveAlign™ Drive Belt Idler Pulley by Gates®. Built to last by resisting dirt, salt, and other under-hood contaminants and are designed for use on passenger cars and light trucks as a locked center tensioning...High quality construction provides high durability for long lifeBearing meets or exceeds OE and is designed for application specific speed and load requirements$31.85
- Continental® ContiTech™Elite™ Drive Belt Idler AssemblyPeterbilt 378 2003, Elite™ Drive Belt Idler Assembly by Continental® ContiTech™. Every part in this assembly is engineered to look, install, and operate the same way or better than the factory parts. Every component meets original...Original equipment equivalentFactory-like fit and dependability$30.49
- Dayco®No Slack™ Heavy Duty Automatic Belt Tensioner AssemblyPeterbilt 378 2003, No Slack™ Heavy Duty Automatic Belt Tensioner Assembly by Dayco®. Serpentine belt drives consist of a single belt that powers most, if not all, of the engine’s accessories. Designed to maintain constant tension...Heavy duty cast aluminum spring case that resists cracking and fatigueSteel pivot tube which provides additional strength for critical torque requirements$183.04
- Dayco®No Slack™ Heavy Duty Idler/Tensioner PulleyPeterbilt 378 2003, No Slack™ Heavy Duty Idler/Tensioner Pulley by Dayco®. Dayco's reputation for top performance idler and tensioner pulleys is a result of advanced automotive technologies employed in materials research, design...Made with precision and quality in mindDesigned to meet your specific needs$35.43
- PAI®Crankshaft Seal KitPeterbilt 378 2003, Crankshaft Seal Kit by PAI®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Perfect blend of leading innovations and superior workmanshipManufactured to offer high value and everlasting reliability$32.32 - $90.81
- PAI®Crankshaft Seal KitPeterbilt 378 2003, Crankshaft Seal Kit by PAI®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Perfect blend of leading innovations and superior workmanshipManufactured to offer high value and everlasting reliability$32.32 - $90.81
- Gates®Automotive XL™ V-BeltPeterbilt 378 L6 10.3L / 12.0L with A/C 2003, Automotive XL™ V-Belt by Gates®. Length: 46". This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and...Made with precision and quality in mindDesigned to meet your specific needs$19.89
- Continental® ContiTech™Conti-V Multirib™ Serpentine BeltPeterbilt 378 2003, Conti-V Multirib™ Serpentine Belt by Continental® ContiTech™. Designed to transmit torque and drive engine accessories, this serpentine belt provides quieter and cooler performance, greater durability, and...OE quality product for safe, reliable, and efficient performanceProvides quiet performance, even in wet conditions$17.04 - $52.89
- Continental® ContiTech™Extreme Duty Multi V-BeltPeterbilt 378 2003, Extreme Duty Multi V-Belt by Continental® ContiTech™. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and...Made with precision and quality in mindDesigned to meet your specific needs$38.06 - $57.83
- Continental® ContiTech™Serpentine BeltPeterbilt 378 10.3L 2003, Serpentine Belt by Continental® ContiTech™. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability....Made with precision and quality in mindDesigned to meet your specific needs$32.09 - $42.38
- Continental® ContiTech™V-Groove Serpentine BeltPeterbilt 378 10.3L / 12.0L 2003, V-Groove Serpentine Belt by Continental® ContiTech™. Length: 46". This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of...Made with precision and quality in mindDesigned to meet your specific needs$17.98
- Dayco®GOLD Label™ Poly Rib Heavy Duty BeltPeterbilt 378 10.3L 2003, GOLD Label™ Poly Rib Heavy Duty Belt by Dayco®. The Dayco Gold Label™ serpentine belt is a diesel grade belt that features higher performance construction over conventional light duty belts in order to meet...The belt’s heavy-duty construction provides additional integrity without sacrificing flexibilityEngineered with high-grade EPDM compounds$48.07 - $61.40
- Dayco®Top Cog™ GOLD Label™ V-BeltPeterbilt 378 10.3L with A/C 2003, Top Cog™ GOLD Label™ V-Belt by Dayco®. Length: 46". Built with cogs in its top, the belt provides additional flexibility around small pulleys while the increased surface area results in a cooler...Constructed to deliver extended life in demanding diesel applicationsCogs in the top of the belt for increased flexibility around small pulleys$17.02
- ACDelco®Professional™ Standard High Capacity V-BeltPeterbilt 378 L6 10.3L / 12.0L with A/C 2003, Professional™ Standard High Capacity V-Belt by ACDelco®. Length: 46". Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$37.74Save: $6.39 (17%)$31.35
- ACDelco®Professional™ Standard V-Ribbed Serpentine BeltPeterbilt 378 L6 10.3L / 12.0L 2003, Professional™ Standard V-Ribbed Serpentine Belt by ACDelco®. Length: 74.1". Made of EPDM rubber for long life and quiet, dependable performance, ACDelco Professional Automotive Belts are designed...Made with precision and quality in mindDesigned to meet your specific needs$111.25Save: $13.04 (12%)$98.21
- Goodyear Belts®Serpentine Multi V-BeltPeterbilt 378 2003, Serpentine Multi V-Belt by Goodyear Belts®. Goodyear Belts has developed multi V-belts that meet or exceed OE requirements, ensuring long belt life and quiet operation. Restore your belt drive system’s efficiency...Meets or Exceeds OEM SpecificationsLong-life EPDM Rubber Compound$19.58 - $47.35
- PAI®Engine Oil PanPeterbilt 378 12.7L 2003, Engine Oil Pan by PAI®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Perfect blend of leading innovations and superior workmanshipManufactured to offer high value and everlasting reliability$632.42
- PAI®Engine Oil Pan GasketPeterbilt 378 2003, Engine Oil Pan Gasket by PAI®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Perfect blend of leading innovations and superior workmanshipManufactured to offer high value and everlasting reliability$38.42 - $180.42
- Dorman HD Solutions®Engine Oil Drain PlugPeterbilt 378 2003, Engine Oil Drain Plug by Dorman HD Solutions®. This replacement engine oil drain plug is a direct replacement for a damaged or worn original equipment drain plug, precisely matching the thread pitch to ensure a...Ideal replacement - this engine oil drain plug matches the fit and function of the original drain plugDurable construction - this replacement drain plug is made of corrosion-resistant materials for reliable service$8.25 - $18.34
- Dorman HD Solutions®Engine Oil Pan GasketPeterbilt 378 14.9L 2003, Engine Oil Pan Gasket by Dorman HD Solutions®. This oil pan gasket is designed to match the fit and function of the original gasket on specified makes, years and models, and is engineered for reliable...Direct replacement - this direct replacement oil pan gasket is designed to match the fit and function of the original component on specified makes, years and modelsRestores functionality - reliable replacement to stop leaks after the original gasket has corroded or deteriorated$199.61
- Gates®Accessory Belt Drive KitPeterbilt 378 2003, Accessory Belt Drive Kit by Gates®. Gates is the largest global manufacturer of OE timing belts. This means Gates is able to cover the Aftermarket with timing belts that are OE-equivalent, or better, in service life...Performing a complete system repair doesn't add much time, but adds a lot of value (and protects against returns)Without proper tension, even the best new belt can’t efficiently transfer power$194.39
- Gates®Green Stripe™ DriveAlign™ Heavy Duty Drive Belt Tensioner AssemblyPeterbilt 378 2003, Green Stripe™ DriveAlign™ Heavy Duty Drive Belt Tensioner Assembly by Gates®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of...Comprehensive line includes parts to fit cars, vans, SUVs, and light trucksFull line coverage for import, domestic, and heavy-duty cars, trucks, and vehicle applications$125.39
- Continental® ContiTech™Elite™ Drive Belt Idler PulleyPeterbilt 378 10.8L 2003, Elite™ Drive Belt Idler Pulley by Continental® ContiTech™. Every part in this assembly is engineered to look, install, and operate the same way or better than the factory parts. Every component meets...Original equipment equivalentFactory-like fit and dependability$27.61
