Ever since the introduction of the latest fourth-generation Chevrolet Silverado HD for the 2020 model year, 2500HD models in the Custom trim level were only available with the gas-powered 6.6L V8 L8T. Other trims were also offered with the 6.6L V8 L5P turbodiesel Duramax. Now, the 2021 Chevy Silverado 2500HD Custom is offered with both the gas-powered 6.6L V8 L8T and the diesel-powered 6.6L V8 L5P.
To note, the 2021 Chevy Silverado 2500HD Custom is available in the following configurations:
- Double Cab / Standard Bed
- Double Cab / Long Bed
- Crew Cab / Standard Bed
- Crew Cab / Long Bed
As for the engine specs, the 6.6L V8 L5P turbodiesel Duramax produces 445 horsepower at 2,800 rpm and 910 pound-feet of torque at 1,600 rpm, while the naturally aspirated 6.6L V8 L5P gas engine produces 401 horsepower at 5,200 rpm and 464 pound-feet of torque at 4,000 rpm. The diesel option mates to a 10-speed automatic transmission, while the gas engine connects to a six-speed automatic transmission.
The Custom trim level sits near the bottom of the 2021 Chevy Silverado 2500HD lineup, slotting above the WT trim, but below the LT, LTZ, and high Country trims.
Under the skin, the 2021 Chevrolet Silverado 2500HD rides on a more capable version of the GM T1 platform, the same bones as the 2021 GMC Sierra 1500 and Sierra HD, the 2021 GMC Yukon SUV, and several of full-size GM trucks and SUVs.