Ford's 6.7L Power Stroke V8 turbocharged diesel engine has a new turbocharger that enables more airflow to the engine to produce additional power.
Photo credit: Photo courtesy of Ford
Ram Truck offers a new 6.4-liter gas engine that has an active air intake and generates 410 hp and 429 lbs.-ft. of torque.
•Towing was a top design goal for the 2015 Chevrolet Silverado and GMC Sierra HD pickups. GM made refinements to the cruise control, Auto Grade Braking and Diesel Exhaust Brake.
The Ram 2500 comes with a five-link coil rear suspension system for ride and handling.
This fall has been a busy time for heavy-duty pickup manufacturers. Sales have been climbing and they have responded by pulling the wraps off even more capable models. The changes have been much more than cosmetic, with increased tow ratings, improved suspensions and further refinements. Let’s take a look at the new class of heavy-duty pickups.
RAM ADDS CAPABILITY FOR 2014
With the 2500 and 3500 pickups, Ram Truck has set a new bar for towing capability. “We took the GCWR of our heavy-duty pickups and chassis cabs to 37,600 lbs.,” says Dave Sowers, head of Ram Truck light-duty and heavy-duty marketing. “That leaves us with a trailer towing capacity of 30,000 lbs.”
The 2014 Ram 2500 features a new frame that incorporates the three-link front suspension from the 3500. This suspension has a long radius arm and three large canned bushings, two on the axle and one on the body. It provides roll stiffness for increased towing and payload capacity. New 18- and 20-in. wheels are also included across the heavy-duty pickup line.
The 2500 also uses a five-link coil rear suspension that helps reduce friction without sacrificing towing capability. This results in better ride quality. “We have increased the GVWR on this truck (gas and diesel) to 10,000 lbs.,” says Kevin Mets, head of Ram Truck heavy-duty pickup engineering. “So we are delivering payloads of nearly 4,000 lbs.”
The five-link coil design incorporates support at all major points of force and resists unwanted axle rotation. It weighs 40 lbs. less than the leaf-spring configuration, while allowing U-joints and driveshafts to run smoothly.
In addition, Ram plans to introduce rear air suspension on the 2500 and 3500 pickups. “On the 2500, we will replace the coil springs with the air suspension, and on the 3500, we will have leaf springs with air bag helpers,” says Sowers. The automated rear air suspension system levels the load to improve stability.
A front-axle disconnect on the front axle of 4WD models aids fuel efficiency. Select drivetrain components are disconnected, improving fuel efficiency by up to 1 mpg.
The Cummins High-Output Turbo Diesel allows you to make the most of the increased towing capacity with 850 lbs.-ft. of torque and 385 hp.
But the big news is the new 6.4-liter gas engine. It was designed to be a truck engine right from the start. “It meets all of the durability requirements that we run on our diesel. It has an active air intake and generates 410 hp and 429 lbs.-ft. of torque,” says Sowers. “The active intake system provides that low-end torque that you need in a pickup truck engine, but it also gives you that high-end power. When you look at the torque curves, what is really great about this engine is it delivers the torque you had in the 5.7-liter about 800 to 1,000 rpm sooner.”
This engine will also feature MDS, which allows the vehicle to go into four-cylinder mode whenever it can for added fuel savings.
GM INCREASES TOWING CONFIDENCE
For 2015, the Chevrolet Silverado and GMC Sierra HD pickups will offer new exterior styling, integrated cruise control, Auto Grade Braking and Diesel Exhaust Braking on diesel models; standard Stabilitrak Trailer Sway Control; 6.5- and 8-ft. boxes with standard CornerStep bumpers; EZ Lift and Lower tailgates; and new cabs and interiors.
The new exterior enhances aerodynamics for improved efficiency and reduced wind noise. It also improves cooling for more consistent power under tough conditions. Inlaid doors fit into recesses in the body side to help reduce cab noise. The roof and tailgate spoiler were tuned in a wind tunnel to smooth airflow over the truck for reduced noise and improve aerodynamic efficiency. Particular attention was paid to airflow for both the engine cooling and engine air intakes.
Towing was also a top design goal. GM made refinements to the cruise control, Auto Grade Braking and Diesel Exhaust Brake to inspire a new level of confidence. The Auto Grade Braking is activated by pressing and holding the tow/haul button for three seconds. The transmission then automatically downshifts when needed to help slow the vehicle. When using the Duramax diesel, the driver can engage the Diesel Exhaust Brake, which uses the variable vanes in the turbocharger to create additional backpressure in the engine to help slow the vehicle.
The combination of the exhaust brake and the automatic transmission downshifts help the driver maintain the desired speed, even on long, steep highway downgrades. Stabilitrak with Sway Control is now standard on all Chevrolet Silverado and GMC Sierra models, including the 3500HD dually.
Payload and towing capabilities have increased from the 2014 HD models. Maximum available payload is now 7,374 lbs., maximum available conventional towing is 19,600 lbs. and maximum available fifth-wheel towing is 23,200 lbs.