The Silverado HD comes with the more impressive standard powertrain, a 6.6-liter gas-powered V8 (401 horsepower, 464 lb-ft of torque) and a six-speed automatic transmission. To haul the heaviest trailer, however, you’re going to want the 6.6-liter Duramax turbodiesel V8 engine (445 hp, 910 lb-ft), which is paired with a 10-speed automatic transmission.
Although the Ford Super Duty’s standard engine isn’t quite as impressive by Comparison, it’s still pretty powerful in its own right. The base 6.2-liter gas-powered V8 (385 hp, 430 lb-ft) is also paired with a six-speed automatic transmission.
Ford offers two engine upgrades for its heavy-duty trucks. A 7.3-liter gas-powered V8 (430 hp, 475 lb-ft) is available to increase hauling capabilities. And a 6.7-liter turbodiesel V8 (475 hp, 1,050 lb-ft) can take tow ratings to new heights.