20k-Mile 2015 GMC Sierra 2500HD Denali Duramax 4×4

Listing Details

• Chassis: 1GTHC29D66E271748
• 152k Miles Shown
• 6.6-Liter Duramax Turbodiesel V8
• Six-Speed Automatic Transmission
• Locking Rear Differential
• Summit White Paint
• Pewter Leather Upholstery
• 16" 10-Hole Aluminum Wheels
• Kobalt Diamond-Plate Tool Box
• Front & Rear Receiver Hitches
• Bed Liner
• Side Steps
• Heated Power-Adjustable Front Bucket Seats
• Bose Sound System w/In-Dash CD Changer
• Dual-Zone Automatic Climate Control
• Clean Carfax Report

This 2006 GMC Sierra 2500HD SLT Extended Cab pickup has been registered in Florida from new, and it remained in the care of its original owner until earlier this year. It is finished in Summit White over Pewter leather and is powered by a 6.6-liter Duramax turbodiesel V8 linked to a six-speed automatic transmission. Equipment includes a locking rear differential, fog lights, front tow hooks, power-adjustable heated side mirrors, side steps, a bed liner, front and rear receiver hitches, a Kobalt diamond-plate tool box, 16″ 10-hole polished aluminum wheels, heated power-adjustable front bucket seats, an AM/FM stereo with an in-dash CD changer, a Bose sound system, cruise control, and dual-zone automatic climate control. This GMT800 Sierra 2500HD has 152k miles and is now offered by the selling dealer at no reserve with the owner’s manual, service records, a Superchips flash tuner, a clean Carfax report, and a clean Florida title. The truck is finished in Summit White, and features include fog lights, front tow hooks, fender flares, power-adjustable heated side mirrors, side steps, a bed liner, front and rear receiver hitches, a Kobalt diamond-plate tool box, and a drop-down tailgate. Mounting brackets for a fifth-wheel hitch are present in the bed. Eight-lug 16″ 10-hole polished aluminum wheels are mounted with Cooper Discoverer HTP tires. Stopping power is provided by anti-lock disc brakes at all four corners. The dampers and rear axle seals were replaced in November 2019, and additional leaf springs have reportedly been added out back. The cabin features seating surfaces upholstered in Pewter leather, and interior amenities include heated power-adjustable front bucket seats, driver-seat position memory, cruise control, dual-zone automatic climate control, a Bose sound system, and an AM/FM stereo with an in-dash CD changer. An electronic brake controller has been added. The multi-function leather-wrapped steering wheel frames a 120-mph speedometer, a 5k-rpm tachometer, and gauges for transmission fluid temperature, oil pressure, fuel level, voltage, and coolant temperature. The digital odometer indicates 152k miles. The 6.6-liter Duramax turbodiesel V8 was factory rated at 360 horsepower and 650 lb-ft of torque. The thermostats were replaced in November 2021, and the oil cooler lines were replaced in January 2024.

isting Details

• Chassis: 1GT422C86FF100246
• 236k Miles
• 6.6-Liter Duramax Turbodiesel V8
• Six-Speed Automatic Transmission
• Dual-Range Transfer Case
• Summit White Paint
• Black Cloth Upholstery
• 18" Chevrolet Wheels
• Heated Front Seats
• Touchscreen Infotainment
• AM/FM/CD Stereo
• Dual-Zone Automatic Climate Control
• Bed-Mounted Fuel Tank w/Pump
• Trailer Brake Controller
• Brush Guard
• Side Steps

This 2015 GMC Sierra 3500HD SLE crew cab pickup was sold new from Allen Samuels Chevrolet GMC in Hearne, Texas, and had one registered owner before being acquired by the selling dealer in 2025. The truck has 236k miles and is powered by a turbodiesel 6.6-liter Duramax V8 that drives the rear or all four wheels through a six-speed automatic transmission and a dual-range transfer case. Finished in Summit White over Jet Black cloth, the truck is also equipped with 18″ Chevrolet wheels, a bed-mounted fuel tank with a GPI pump, an AM/FM/CD stereo, heated front seats, touchscreen infotainment, dual-zone automatic climate control, and cruise control. This K2XX Sierra 3500HD is now offered by the selling dealer at no reserve with a clean Texas title. The crew-cab bodywork is finished in Summit White (GAZ), and exterior equipment includes moveable cargo-bed tie-downs, Z71 badging, recovery hooks, side steps, a brush guard, a receiver hitch, and projector-style headlights. Paint loss on the hood, tailgate, and other areas can be viewed in the gallery. Chips and scratches are present throughout, and the condition of the cargo bed can also be viewed below. The cargo bed houses an auxiliary fuel tank with a GPI transfer pump. Three of the mounted wheels are 18″ Chevrolet-sourced units, and the matching fourth is located in the bed. The fourth mounted wheel is the steel spare, and its Goodyear Wrangler tire has sidewall cracking. Newer Goodyear Wrangler tires are mounted on the bowtie-branded wheels. The truck is equipped with variable-assist power steering in addition to Stabilitrack stability control, hill-start assist, and four-wheel disc brakes. The cabin is upholstered in Jet Black cloth, and upholstery and foam damage are visible on the driver’s seat. Interior appointments include heated front seats, an AM/FM/CD stereo, touchscreen infotainment, dual-zone automatic climate control, a trailer brake controller, and cruise control. The front-seat headrests are missing. The four-spoke steering wheel frames a 140-mph speedometer, a 5k-rpm tachometer, and supplementary gauges. The digital odometer indicates 236k miles, approximately five of which were added under current ownership. The check engine light is illuminated.

Listing Details

• Chassis: 1GT12REY3KF252603
• 80k Miles
• Turbodiesel 6.6-Liter Duramax V8
• Six-Speed Automatic Transmission
• Summit White Paint
• Jet Black Upholstery
• 20" Denali-Sourced Wheels
• Bedliner
• Side Steps & Rear Corner Steps
• Front & Rear Parking Sensors
• Dual-Zone Automatic Climate Control
• Bose Audio & CD Player
• Heated Front Seats
• Exhaust Brake
• Clean Carfax Report

This 2019 GMC Sierra 2500HD SLT crew cab pickup is finished in Summit White over Jet Black upholstery, and is powered by a turbodiesel 6.6-liter Duramax V8 that drives the rear or all four wheels through an Allison six-speed automatic transmission and a dual-range transfer case. Equipment includes 20″ Denali wheels, an exhaust brake, side steps, front and rear parking sensors, a bedliner, heated front seats, a Bose sound system, a CD stereo, dual-zone automatic climate control, and cruise control. Approximately 72k of the 80k indicated miles were added by the seller. This K2XX Sierra 2500HD is now offered with the owner’s manual, a clean Carfax report, and a clean California title in the seller’s name. The crew-cab bodywork is finished in Summit White (GAZ), and exterior equipment includes side steps, front and rear parking sensors, a bedliner, rear corner steps, moveable cargo-bed tie-downs, recovery hooks, and projector-style headlights. The 20″ multi-spoke alloy wheels were reportedly sourced from a 2022 GMC Denali, and they are mounted with Michelin tires. The truck is equipped with variable-assist power steering in addition to Stabilitrack stability control, hill-start assist, a trailer brake, and four-wheel disc brakes. The cabin is upholstered in Jet Black, and interior appointments include heated front seats, a Bose sound system, a CD stereo, dual-zone automatic climate control, and cruise control. The leather-wrapped steering wheel frames a 140-mph speedometer, a 5k-rpm tachometer, supplementary gauges, and a digital display. The digital odometer indicates 80k miles, approximately 72k of which were added under current ownership. The turbodiesel 6.6-liter Duramax V8 was factory rated at 445 horsepower and 910 lb-ft of torque. The truck is equipped with an exhaust brake.

Listing Details

• Chassis: 1GT12UE82GF258144
• 101k Miles
• Replacement Turbodiesel 6.6L V8
• Narrow-Journal Crankshaft
• Wagler Connecting Rods
• Alternate-Firing-Order Camshaft
• Compound Turbo Setup
• Six-Speed Allison Automatic Transmission
• Dual-Range Transfer Case
• Locking Rear Differential
• Onyx Black Paint
• Jet Black Leather Upholstery
• 22" American Force Wheels
• Cognitio Upper Control Arms
• Fox Shocks
• Wilwood Six-Piston Disc Brakes
• Wehrli Custom Traction Bars
• Heated & Ventilated Front Seats
• Lock'er Down Console Safe
• Smartphone Integration
• Window Sticker & Build Sheet
• Clean Carfax Report

This 2016 GMC Sierra 2500HD Denali crew cab pickup is powered by a replacement turbodiesel 6.6 Duramax V8, which was built by SoCal Diesel with a new GM block and later rebuilt by Wagler Competition. It features a narrow-journal crankshaft, Wagler connecting rods, high-performance pistons, an alternate-firing-order camshaft, CNC-ported heads, a compound turbo setup, an Exergy Performance fuel pump, and 150%-over injectors. The six-speed Allison automatic transmission was rebuilt in 2017 with various billet components and again in 2024, and it is paired with a dual-range transfer case and a locking rear differential. Additional modifications include Cognito upper control arms, Fox shocks, Wehrli Custom traction bars, a leveling kit, Wilwood six-piston disc brakes, and 22″ American Force wheels. The Onyx Black exterior is joined by a Jet Black perforated leather interior, and further details include a folding tonneau cover, a bed liner, heated and ventilated front bucket seats, a Lock’er Down console safe, remote start, dual-zone automatic climate control, an infotainment system with smartphone integration, and JL Audio components. This K2XX Sierra 2500HD was purchased new by the seller and has 101k miles. It is now offered with the window sticker, the owner’s manual, a build sheet, service records, spare parts, a clean Carfax report, and a clean Florida title in the seller’s name. The crew-cab bodywork is finished in Onyx Black (GBA), and exterior equipment includes a power-sliding rear window, running boards, front and rear parking sensors, an Extang folding tonneau cover, a bed liner, moveable cargo-bed tie-downs, recovery hooks, tinted windows, and projector-style headlights. The seller tells us that a ceramic coating was applied in 2025. The suspension system has Cognito upper control arms, Fox shocks, Wehrli Custom traction bars, and a leveling kit. The steering system features Kryptonite tie rods, which were installed in 2024, along with a pitman arm and idler arm support kit. The four-wheel disc brakes have been modified with a Wilwood six-piston big-brake kit, and a Wehrli Custom master cylinder cover has been fitted. The 22″ American Force wheels are mounted with Nitto NT420V tires, which were said to have been installed in June 2023. The cabin is upholstered in Jet Black perforated leather. Interior appointments include heated and ventilated front bucket seats, remote start, a Lock’er Down console safe, a Bose sound system, dual-zone automatic climate control, and an 8″ infotainment screen with navigation, Apple CarPlay, and Android Auto capability. The audio system has been modified with a JL Audio 300-watt amplifier and 10″ subwoofer. The heated steering wheel frames a 140-mph speedometer, a 6k-rpm tachometer, and supplementary gauges. An Edge CTS3 Insight monitor is mounted to the windshield. The digital odometer indicates 101k miles. The replacement turbodiesel 6.6 Duramax V8 was built by SoCal Diesel in 2017, and it was rebuilt in March 2024 by Wagler Competition. It has a billet stock-stroke narrow-journal crankshaft with Wagler connecting rods, high-performance pistons, a Stage 3 alternate-firing-order camshaft, Stage 2 CNC-ported heads, and a compound turbo setup featuring a Forced Inductions S485 V5 unit and Wehrli Custom components. Additional modifications include:

• Exergy Performance 12mm stroker CP3 pump and 150%-over injectors
• PureFlow AirDog II lift pump
• Mishimoto intercooler
• L5P-style oil cooler
• 400amp Powermaster alternator
• Wehrli Custom air intake
• Flowpro straight-piped exhaust system

A fluids service was performed in preparation for the sale. The six-speed Allison automatic transmission was rebuilt in 2017 with various billet components and again in 2024, when an SFI-approved billet flywheel was installed. It is paired with a dual-range transfer case and a locking rear differential, and further details include a Mishimoto transmission cooler and a Mag-Hytech transmission pan and rear differential cover.