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The 2020-2026 GM HD rides on the newer T1 heavy-duty chassis with torsion-bar independent front suspension and model-specific 2500HD or 3500HD hardware.
Control arms, tie rods, torsion settings, steering support, and tuned shocks should match trim, lift height, axle weight, and SRW or DRW configuration.
Synergy Manufacturing Steering Stabilizer ClampsSYN-4050-38$85.00
Daystar Shock Boots PairDAY-KU20002BK$11.02
FOX 2.0 Performance Series Smooth Body IFP Steering Stabilizer ShockFOX-985-24-068$229.95
Fox 2.0 Aluminum Reservoir Mounting ClampFOX-803-02-044$55.00
PSC Power Steering Fluid 4-PackPSC-FL-SWE715-4PAK$75.00
Schaeffer's SynForce Green Waterproof Grease Single TubeSL-0219$11.40
The current L5P uses Denso common-rail injection, a variable-geometry turbo, and modern EGR, DPF, and SCR aftertreatment with meaningful year-to-year revisions.
Confirm model year before choosing filtration, charge-air, cooling, emissions-compliant performance, or monitoring components.
FASS Fuel Systems Titanium/Signature Series XL Water Separator & Fuel Filter PackFASS-FP3000XL$60.25
Edge Insight CTS3 Digital Touch Screen Gauge MonitorEDG-84130-3$549.95
FASS Fuel Systems Titanium/Signature Series (2) Water Separator & (2) Fuel Filter PackFASS-FP3000$108.26
Airdog Replacement Fuel Filter & Water Separator PackPFT-FILTERPACK$59.00
Schaeffer's 9000 SynShield OTR Plus Full Synthetic 5W-40 Engine Oil 5W-40 1 GallonSL-540S$59.99
MBRP Armor Lite 4" Aluminized Muffler Delete Pipe (36" Long)MBRP-MDA36$69.99
The 2020-2026 L5P pairs with the Allison-branded 10L1000 ten-speed automatic rather than the earlier six-speed Allison.
Use ten-speed-specific fluids, filters, cooling, converters, and calibrations matched to the truck's torque rating and towing load.
Schaeffer's All-Trans Supreme Transmission FluidSL-0204SAT$20.99
Schaeffer's Dexron VI/Mercon LV Automatic Transmission FluidSL-205A$15.29
BD 1030607 Universal Transmission Cooler Electric Fan Assembly 80 Watt 10 Inch 800 CFMBD-1030607$73.06
SunCoast Case Of 3 Full Synthetic Transmission FluidSC-TYPE-D ATF CASE$195.00
Hot Shot's Secret Shift Restore Oil Additive - 32oz.HSSTSE32Z$46.99
PPE Transmission Harness Removal Tool 4L60E 4L80E Allison 1000PPE-128043100$22.49
The 2020-2026 GM HD uses large brakes and model-specific 8-on-180-millimeter SRW or DRW wheel geometry.
Confirm 2500HD or 3500HD configuration, offset, brake clearance, axle rating, and tire load range before changing wheel or tire size.
ICON Alloys Rock Ring Kit | 17" Wheel 20 BoltIA-192050$41.61
Kryptonite Valve Stem Cap SetKRY-KRVSC$12.34
ARB 819104 External TPMS 4 Sensor SystemARB-819104$227.00
Apex Designs RPV Rapid Precision Tire Deflation ValveAPXD-X02-02-002$40.00
ARB Digital Tire InflatorARB-ARB601A$90.95
ARB 10000011 Speedy Seal SII Tire Repair KitARB-10000011$54.95
Modern GM HD axle packages vary by model, SRW or DRW layout, drive type, ratio, and electronic locking-differential equipment.
Match the axle RPO code and housing to the correct gears, locker, cover, hubs, bearings, and service components.
Schaeffer's Oil Supreme Gear Lube Synthetic Plus SAE 75W-90SL-7590$22.49
Schaeffer's Oil Supreme Gear Lube Full Synthetic SAE 75W-140SL-75W140-Single$34.49
AFE Pro Guard D2 Fully Synthetic Limited Slip Gear Oil 75W-140 Single Qt.AFE-90-20101$26.00
AFE Pro GUARD HD Synthetic Gear Oil 75W-90AFE-90-20001$26.00
AFE Differential Cover Sight GlassAFE-46-00001$38.00
AFE Deep Reach Magnetic Fill PlugAFE-46-00002$38.00
Current-generation towing cameras, bed power, auxiliary fuel, lighting, recovery equipment, and detailed monitoring can extend the L5P truck's factory capability.
Choose T1-generation mounts and network-compatible wiring so accessories do not interfere with sensors, cameras, or driver-assistance systems.
Customs Unlimited Magnetic Rock Light Mount KitCU-HW-MRM-STD$9.00
Baja Designs Tamperproof Security Hardware KitBAJA-660303$15.95
Baja Designs LP4 Single Rock GuardBAJA-298001$20.95
PacBrake HP325 Series Basic 12V Air Compressor KitPB-HP10167$217.06
Fleece Performance Multiuse Sensor Pigtail 94-07 Powerstroke / 04.5-16 DuramaxFPE-HAR-MU-PT-10$14.99
Customs Unlimited Valance Light KitCU-VL-15-SMKAMB+DT$125.00
The 2020 - 2026 Chevy / GMC 6.6L L5P Duramax trucks have seen significant updates, particularly with the bold redesign of the Chevrolet models. However, while the aesthetics might have divided opinions, what’s truly exciting is the serious upgrades under the hood. GM has made remarkable improvements in the powertrain department, setting the L5P Duramax apart from its predecessors.
One of the standout features is the transition from the reliable Allison 6-speed automatic transmission to a new 10-speed automatic. The increased number of gears allows for smoother transitions, making towing and hauling much easier while optimizing performance. Whether you're towing a heavy load or cruising, the 2024 Chevy Duramax and 2024 GMC Duramax have the tools to handle it with precision.
The L5P Duramax engine remains powerful with its 445 horsepower and 910 lb-ft of torque, but the real upgrade is in the towing capacity, which has jumped to a staggering 35,500 pounds. The improvements in cooling systems, including a larger oil cooler and a new, more efficient fan, ensure that even when towing at capacity, your 6.6 Duramax will maintain optimal operating temperatures.
For those in colder climates, GM has made a smart move by integrating a larger block heater, along with a more convenient bumper placement for the heater cord. Additionally, the 2024+ L5P Duramax features a built-in cool-down timer that prevents the engine from overheating after heavy use, automatically cooling the engine when needed.
Upgrading your 2020 - 2026 L5P Duramax opens up a world of possibilities for enhanced power and efficiency. Consider these top upgrades:
With time, fuel injectors in the Chevy Duramax or GMC Duramax can lose efficiency. Upgrading to high-performance injectors restores power and ensures optimal fuel delivery.
A turbo upgrade is one of the most effective ways to boost the performance of your L5P Duramax turbo diesel, providing better throttle response and increased horsepower.
A high-flow exhaust system reduces backpressure and allows your 6.6 Duramax to produce more power while maintaining lower EGTs (Exhaust Gas Temperatures).
Installing a cold air intake system ensures your L5P Duramax pulls in cooler, denser air for improved combustion and overall power gains.
Fine-tuning your truck with a performance chip lets you unlock more power from your L5P Duramax, whether for everyday driving or heavy towing.
At Diesel Power Products, we offer a carefully curated selection of high-performance parts for the 2020 - 2026 L5P Duramax. Our team consists of diesel experts who understand how these trucks operate, allowing us to provide the best guidance and recommendations for optimizing your vehicle’s performance.
Our parts catalog includes high-quality injectors, turbo upgrades, exhaust systems, and more for your 6.6 Duramax. Each product is tested to ensure it meets rigorous performance standards, and we’re committed to helping you find the right part for your needs. Whether you’re seeking better fuel efficiency or want to boost horsepower, Diesel Power Products has what you need.
When you're ready to take your 2020 - 2026 Chevy Duramax or GMC Duramax to the next level, check out our wide range of performance parts. From injectors and turbo kits to cold air intakes and exhaust systems, we offer everything you need to keep your L5P Duramax performing at its best. Have questions? Check out our FAQs or give us a call. At Diesel Power Products, we’re here to keep your 6.6L Duramax running strong for the long haul.
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