The GMC Sierra Heavy Duty pickup is all-new for the 2020 model year, and that means extensive changes, both above and below the surface. Now, we’re taking a look at what’s going on underneath this highly capable truck by peeking at the undercarriage.
Looking over these photos, we can see a good deal of the mechanical components. We can also see the fully boxed frame, which provides a sturdy backbone for this powerful workhorse vehicle.
The engine in play here is the turbo-diesel 6.6L L5P V8, part of the Duramax engine family, which lays down an impressive 445 horsepower and 910 pound-feet of torque. The ‘eight mates to an all-new, segment-first Allison 10-speed automatic transmission, which, as we covered previously, isn’t actually an Allison transmission. We also see the optional Autotrac two-speed transfer case, not to mention an absolutely gargantuan drive shaft to help harness the turbo-diesel’s mammoth output.
All told, the 2020 GMC Sierra HD’s larger frame, strong propulsion system, and onboard tech combine to deliver a maximum towing capability up to 35,500 pounds. That’s an increase of 52 percent compared to the previous model-year vehicle.
To note, the 2020 GMC Sierra HD truck is also offered with the 6.6L L8T gas engine, which was introduced as a replacement for the previous 6.0L L96 V8, and produces 401 horsepower and 464 pound-feet of torque. The L8T mates to a six-speed automatic transmission.
Other details we can spot from this low angle include the exhaust pipes and the X31 Off-Road suspension bits, including the Rancho shocks. Don’t forget the braking components, the side step-ups, and the low-mounted spare wheel as well.
Indeed, there’s a lot to pick apart from these undercarriage photos of the 2020 GMC Sierra 2500HD. What stands out to you the most? Let us know in the comments, and make sure to subscribe to GM Authority for more GMC Sierra news, GMC news, and around-the-clock GM news coverage.