For whatever reason, the powers that be at GM allowed the fancy-pants GMC brand to launch its Sierra version of the new heavy-duty pickups a few weeks ahead of the volume-selling 2020 Chevrolet Silverado HD, but didn’t allow the “Professional Grade” folks to spill all the power, torque, payload, and towing beans. Chevy has just spilled them:
The 6.6-liter Duramax diesel, which has been lightly revised and retuned to work with an all-new GM/Allison 10L1000 10-speed automatic transmission, is still rated at 445 hp at 2,800 rpm and 910 lb-ft at 1,600 rpm, but thanks to further chassis and downstream powertrain reinforcements the max tow rating jumps by 52 percent to a best-in-class-for-now 35,500 pounds. That bests the 1,000-lb-ft Ram by one (400-pound) sumo wrestler.
GM reps were also quick to brag that, although 910 is undeniably less than 1,000, at least the GM powertrain can put all 910 of its torques to the ground in first gear, thanks to the aforementioned driveline component reinforcements (subtly implying that the other brands’ trucks are torque-managed to some lower number in the lower gears—an aspersion we’ve yet to confirm).