The 2021 GMC Sierra 2500HD SLE, equipped with the 6.6L Duramax turbo-diesel engine, SLE Convenience Package, and Gooseneck/Fifth-Wheel Prep Package, offers a robust combination of power, comfort, and towing capability, making it a standout choice for heavy-duty truck enthusiasts.

Powertrain and Performance

At the heart of this Sierra 2500HD is the formidable 6.6-liter Duramax V8 turbo-diesel engine, delivering 445 horsepower and a commanding 910 lb-ft of torque. Paired with the Allison 10-speed automatic transmission, this powertrain ensures smooth and efficient power delivery, whether hauling heavy loads or cruising on the highway. The truck boasts a maximum towing capacity of up to 18,510 pounds and a payload capacity of approximately 3,857 pounds, making it well-suited for demanding tasks.
reliabledealer.com

SLE Convenience Package

Enhancing the SLE trim, the SLE Convenience Package adds a suite of features designed for comfort and convenience. Key inclusions are:

Dual-zone automatic climate control

10-way power-adjustable driver's seat with power lumbar support

Heated front seats and heated steering wheel

Remote start system

Keyless open and start

Rear-window defogger and power sliding rear window

LED fog lights and cargo bed lighting

Front 40/20/40 split-bench seat with underseat storage

Rear wheelhouse liners

Two charge-only USB ports for the second row

Rear auxiliary 12-volt power outlet

Content theft alarm and steering column lock
GM Authority
+2
www.allcarsonline.com
+2
CarBuzz
+2
Edmunds
+7
GM Authority
+7
CarBuzz
+7
CarBuzz
CarsDirect
+3
CarBuzz
+3
GM Authority
+3

Gooseneck/Fifth-Wheel Prep Package

For those requiring serious towing capabilities, the Gooseneck/Fifth-Wheel Prep Package offers a factory-installed hitch platform integrated directly into the truck's frame. This setup includes:
GMC
CarBuzz

Factory-installed hitch platform welded to the frame for enhanced strength

Precisely drilled and finished floor openings for the gooseneck ball hitch and fifth-wheel mounting points

Spray-on bedliner to protect the cargo box

In-bed trailer wiring connector for seamless connectivity

Compatibility with a chrome-plated 2 5/16 hitch ball and forged anchors, available through GMC dealers
Edmunds
+3
GMC
+3
GM Authority
+3

Interior and Technology

Inside, the Sierra 2500HD SLE offers a spacious cabin with high-quality materials and thoughtful storage solutions. The infotainment system features an 8-inch touchscreen with Apple CarPlay and Android Auto compatibility, ensuring seamless smartphone integration. Additional amenities include a leather-wrapped steering wheel with audio and cruise controls, multiple USB ports, and ample cupholders throughout the cabin.

Safety and Driver Assistance

Safety is paramount in the Sierra 2500HD. Available driver-assistance features include:
www.allcarsonline.com
+3
reliabledealer.com
+3
Edmunds
+3

Forward Collision Alert

Lane Departure Warning

Rear Cross Traffic Alert

Lane Change Alert with Side Blind Zone Alert

Front and Rear Park Assist

Safety Alert Seat
CarBuzz
+1
reliabledealer.com
+1

These technologies work in concert to enhance driver awareness and help prevent potential collisions.

Conclusion

The 2021 GMC Sierra 2500HD SLE with the 6.6L Duramax turbo-diesel engine, SLE Convenience Package, and Gooseneck/Fifth-Wheel Prep Package stands as a formidable heavy-duty truck. Its combination of powerful performance, advanced towing capabilities, and a suite of comfort and safety features make it an excellent choice for those who demand both strength and sophistication in their vehicle.