2001-2004 LB7 Duramax

The 2001–2004 LB7 Duramax launched GM’s modern diesel era, delivering quiet power and incredible efficiency for Silverado and Sierra HD trucks. Known for its strong block, mechanical simplicity, and excellent towing performance, the LB7 quickly earned a reputation for reliability and easy upgrades. Whether you’re replacing injectors, upgrading turbos, or performing routine maintenance, Thoroughbred Diesel has the parts and expertise to keep your LB7 running clean and powerful.

Our selection of 2001–2004 LB7 Duramax parts covers everything from factory replacements to proven performance upgrades. Popular products include S&B and AFE cold air intake systems, Edge Evolution tuners, Industrial Injection injectors, and BD Diesel turbo components for added power and reliability. Many owners also upgrade to FASS or AirDog lift pumps, PPE transmission coolers, MBRP exhaust systems, and ARP head studs for long-term durability. For maintenance and restoration, we stock complete gasket kits, sensors, and filters to keep your early-generation Duramax running like new.

Whether you’re restoring a classic Silverado 2500HD, maintaining your Sierra 3500HD workhorse, or building a performance project, Thoroughbred Diesel has the right parts, brands, and experience for your 6.6L LB7 Duramax. Browse by category, explore trusted brands, or shop our featured products below — everything you need for your 2001–2004 LB7 Duramax is right here.

Watch Our LB7 Duramax Tech & Upgrade Videos

The **2001–2004 LB7 Duramax** introduced GM’s first common-rail diesel engine to the Silverado and Sierra HD lineup. Known for strong power and smooth performance, these Thoroughbred Diesel videos explore injector upgrades, fuel system maintenance, and tuning options to help your LB7 run stronger for longer.

🔗 Visit the Thoroughbred Diesel YouTube Channel

LB7 Duramax Injectors, CP3 Pumps, Turbo & Fuel System Upgrades

The 2001–2004 GM 6.6L LB7 Duramax was the engine that started it all for the Duramax nameplate, introducing a new level of diesel performance to Chevrolet Silverado HD and GMC Sierra HD trucks. With 300 horsepower and 520 lb-ft of torque from the factory, the LB7 offered strong towing capability, excellent throttle response, and smooth operation for its time. Its common-rail injection system brought modern efficiency to the diesel market and established GM as a leader in light-duty diesel power. Thoroughbred Diesel proudly offers a full line of parts and upgrades to keep your 6.6L LB7 Duramax performing at its best.

• Thoroughbred Heavy Duty Head Stud Kit - 01-16 Duramax
• Edge Insight CTS3 (84130-3) & Edge EGT Probe with Lead (98620)
• Edge Insight CTS3 Digital Gauge Touchscreen Monitor
• FASS Titanium Signature Series Diesel Fuel Lift Pump - 01-10 GM Duramax (165gph)
• FASS Titanium Signature Series Diesel Fuel Lift Pump - 01-10 GM Duramax (100gph)
• Bully Dog GT Platinum Diesel Tuner
• Edge EAS EGT Kit (Daily Driver/Tow Kit) - 98620
• PPE Double-Deep Spin-On Filter - 01-19 GM Duramax - Allison 1000/2000 Series
• Fleece Fuel Injection Lines - 01-04 GM Duramax LB7
• G&R Diesel Billet Aluminum Bottom Sump w/ Integrated Fuel Return System - Universal
• PPE Replacement High Flow Up-Pipe - 01-04 GM Duramax 6.6L
• Racor Stock Replacement Fuel Filter - 01-16 GM Duramax 6.6L LB7/LLY/LBZ/LMM/LML - PFF50216
• PPE Electric Fuel Lift Pump - GM Duramax - 113050000
• Merchant Automotive Rubber Fuel Hose Kit - 01-04 Duramax LB7
• Beans Diesel-Bean Machine Multi Function Fuel Tank Sump Kit
• Suncoast Billet Flex Plate - 01-05 Duramax LB7/LLY & 11-16 Duramax LML
• RedHead Steering Gears - Steering Gear Box w/3 Master Spline Output Shaft - 01-07 GM 2500/3500 4WD, 99-06 GM 1500 4WD
• WC Fab GM Billet Heater Core Fitting Kit With Hose
• PPE Up-Pipes Bolt Set (12pc) - 01-16 GM Duramax 6.6L
• Racor Fuel Filter Head Assembly - 2001-2004 Duramax LB7 - PFF4245R2-04
• Fleece Allison Transmission Cooler Lines - 01-05 GM (LB7-LLY)
• PPE T4 Turbo Pedestal - 01-10 GM Druamax - 116005059
• AirDog II 5G Lift Pump (100 GPH) - 01-10 GM Duramax
• ARP Head Studs - 01-16 GM Duramax (ARP 2000 Material) - 230-4201