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2020 Chevrolet Silverado 2500HD LTZ

$56,000

Year

2020

Make

Chevrolet

Model

Silverado

Odometer

46,000

Engine

Duramax 6.6L Turbo Diesel V8

Fuel Type

diesel

Transmission

automatic

Drivetrain

4×4

VIN / Chassis #

1GC4YPEY3LF125688

Seller

private party

Location

Scottsboro, AL

Title Status

clean
CARFAX Report
A low-mileage Duramax-powered Silverado 2500HD LTZ with the Allison 10-speed, premium maintenance, thermal-management upgrades, dual alternators, and a strong utility setup, this 2020 Chevrolet Silverado 2500HD Crew Cab 4x4 is offered by a private seller in Scottsboro, Alabama with 46,000 miles and a clean title. Power comes from the 6.6L Duramax turbo-diesel V8 paired with the Allison 10-speed automatic transmission, while the seller has added a NextGen valve body upgrade, Banks transmission and engine oil pans, premium fluid services, Michelin tires, AMP Research power steps, a Retrax power bed cover, custom leather seat covers, and a 2500-watt bed-mounted inverter. 
  • Duramax/Allison Tow-Rig Foundation: The 6.6L Duramax diesel and Allison 10-speed offer a strong starting point for a modern HD tow rig, with factory ratings of 445 horsepower and 910 lb-ft of torque. Chevrolet paired the Duramax with the Allison 10-speed for 2020, and the seller has focused upgrades around transmission control, fluid capacity, and cooling rather than performance tuning. 
  • Transmission and Thermal-Management Upgrades: The Allison 10-speed has been upgraded with a NextGen valve body designed to address factory pressure and shift-quality weak points, along with a Banks extra-capacity aluminum transmission pan and full transmission fluid exchange using Shell Synthetic Spirax S6 fluid. A Banks extended-sump aluminum engine oil pan further supports heat management and fluid capacity, which is exactly the kind of preventative upgrade buyers like to see on a diesel truck intended for towing and long-term use.
  • Premium LTZ Equipment and Utility Add-Ons: LTZ trim brings the core factory comfort and towing hardware buyers want, including leather-appointed seating, Advanced Trailering System, Hitch Guidance with Hitch View, Digital Variable Steering Assist, Autotrac 2-speed transfer case, power-folding/extending trailering mirrors, LED lighting, remote start, dual-zone automatic climate control, heated steering wheel, heated power front seats, and an 8-inch HD infotainment system. The seller has added custom two-tone perforated Ecstasy leather seat covers, AMP Research power running boards, WeatherTech liners, a Retrax power-retractable bed cover with integrated LED bed lighting, and a bed-mounted 2500-watt inverter. 
  • Complete Fluid Service and Preventative Maintenance: In October 2025, the truck received a broad fluid service covering the cooling system, power steering, transfer case, front and rear differentials, brakes, engine oil, air filter, cabin filter, and batteries. The seller notes premium fluids throughout, including Dexcool/distilled water, Redline power steering fluid, Redline D4 transfer case fluid, Redline differential fluids, Wilwood brake fluid, Shell Rotella T6 synthetic engine oil, and new AutoZone Gold premium batteries.
  • Clean Alabama CARFAX History: CARFAX lists two-owner personal-use Alabama history, no accidents or damage, and a clean title. Recent CARFAX entries show service at Guntersville Chevrolet in October 2025 and a June 2026 drivability/performance and transmission check at 45,574 miles. 
About the 2020 Chevrolet Silverado 2500HD LTZ
The 2020 Silverado HD was a major redesign for Chevrolet’s heavy-duty lineup, built around increased capability, a stiffer chassis, improved cooling, larger driveline components, and more advanced trailering technology. For Duramax-equipped trucks, the combination of the 6.6L turbo-diesel V8 and Allison 10-speed automatic gave the platform serious towing credibility, while the fully boxed frame, upgraded cooling package, larger axles, and integrated trailering systems made the truck more confidence-inspiring under load. 

The LTZ trim sits in the sweet spot for buyers who want a real work-capable diesel without stepping all the way into High Country luxury. It adds the towing, lighting, mirror, comfort, and technology features that make a heavy-duty truck easier to live with every day, while still retaining the core Duramax/Allison work-truck foundation.

Powertrain
  •  6.6L Duramax turbo-diesel V8 
  •  Factory rating: 445 horsepower & 910 lb-ft of torque 
  •  Allison 10-speed automatic transmission 
  •  4x4 drivetrain 
  •  Autotrac 2-speed transfer case 
  •  NextGen valve body upgrade for Allison 10-speed 
  •  Banks extra-capacity aluminum transmission pan 
  •  Full transmission fluid exchange with Shell Synthetic Spirax S6 fluid 
  •  Banks extended-sump aluminum engine oil pan 
  •  Factory GM transmission recall completed (12/25) 
  •  Factory dual alternators: 200-amp OE plus 170-amp auxiliary 
  •  Always serviced with Shell Rotella T6 full synthetic engine oil 
  •  New AutoZone Gold premium batteries installed (10/25) 
Exterior and Utility
  •  Gray exterior 
  •  Crew Cab body 
  •  LTZ trim 
  •  275/65R20 Michelin Agilis CrossClimate tires with approximately 10,000 miles 
  •  AMP Research power-deploying running boards 
  •  Retrax power-retractable bed cover 
  •  Integrated LED bed lighting 
  •  Bed mat 
  •  2500-watt power inverter mounted in bed area with custom power connections 
  •  AVS vent visors 
  •  Front and rear mudflaps 
  •  Custom painted/red grille and tailgate lettering 
  •  Upgraded LED tag lights 
  •  Upgraded front turn signal lights 
  •  High-output LED reverse lights with dedicated override switch 
  •  Standard LTZ LED headlamps, taillamps, daytime running lamps, and fog lamps 
  •  Power-folding and power-extending trailering mirrors 
  •  Durabed cargo box with integrated BedSteps and CornerSteps 
Interior
  •  Custom two-tone perforated Ecstasy leather seat covers 
  •  LTZ leather-appointed interior 
  •  Heated 10-way power front seats 
  •  Heated leather-wrapped steering wheel 
  •  Dual-zone automatic climate control 
  •  Remote start 
  •  Keyless Open and Start 
  •  Chevrolet Infotainment 3 Plus with 8-inch HD touchscreen 
  •  Apple CarPlay / Android Auto 
  •  HD Radio 
  •  Bluetooth audio streaming 
  •  Advanced Trailering System 
  •  Hitch Guidance with Hitch View 
  •  HD Rear Vision Camera 
  •  120-volt power outlet 
  •  WeatherTech front and rear floor liners 
  •  Rear underseat storage 
  •  Steering-wheel-mounted controls 
Recent Service & Maintenance
  •  Drivability/performance checked; transmission checked (06/26)
  •  Factory GM transmission recall completed (12/25)
  •  Complete cooling system service: engine block, radiator, and EGR cooling system drained, flushed, and refilled (10/25)
  •  Power steering flushed and filled with Redline power steering fluid (10/25)
  •  Transfer case serviced with Redline D4 transmission fluid (10/25)
  •  Front differential serviced with Redline 75W80 fluid (10/25)
  •  Rear differential serviced with Redline 75W90 fluid (10/25)
  •  Brake system flushed with Wilwood high-performance brake fluid (10/25)
  •  New AutoZone Gold premium batteries installed (10/25)
  •  Recent air filter and cabin filter replacement (10/25)
  •  Vehicle serviced at Guntersville Chevrolet (10/25)
  •  Maintenance inspection completed at Guntersville Chevrolet (07/22)
  •  Fuel filter replaced; oil and filter changed; tire condition and pressure checked; tires rotated; wipers replaced (09/21)
  •  Oil and filter changed; tires rotated (06/20)
Condition Notes
The seller describes the truck as exceptionally clean, rust-free, mechanically flawless, and equipped with a clean title. CARFAX reports no accidents or damage, no structural damage, no airbag deployment, no odometer rollback, no open recalls, and no title brands. The seller notes professional wiring improvements and additional lighting enhancements; buyers should confirm the details of those electrical modifications, the NextGen valve body install documentation, and receipts for the October 2025 service work.

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