2010 Dodge Ram Heavy Duty

• Competes with: Ford F-Series, Chevy Silverado
• Looks like: A bigger version of the redesigned Ram 1500
• Drivetrain: 383-hp, 6.7-liter diesel
• Hits dealerships: Late 2009

Chrysler is firing the first shot in what's certain to be a brutal battle pitting three-quarter and one-ton truck manufacturers against each other: It's introducing the new 2010 Dodge Ram 2500 and 3500 heavy-duty pickups at the 2009 Chicago auto show.

The 2010 model year will be a challenging one for several reasons: The U.S. economy is expected to still be sputtering, with new-truck buyers likely sitting on the sidelines for awhile. The price of diesel fuel (the lifeblood of heavy-duty pickups) shows no sign of losing its 20 percent price premium over gas. Most important of all, though, Ford and GM are also expected to launch updated heavy-duty pickups with new diesel powertrains designed to meet stringent 2010 federal emissions standards that go into effect Jan. 1. The regulations will ratchet down NOx levels to the lowest on the planet — more than 90 percent lower than 2006 levels. NOx is a major air pollutant that contributes to smog, asthma, and respiratory and heart diseases. It's a byproduct of high combustion temperatures.

Chrysler has strategically prepared for 2010 over the past two years. In 2007, it introduced for its heavy-duty pickups an enhanced and innovative 350-horsepower, 650-pounds-feet-of-torque, 6.7-liter six-cylinder Cummins diesel, based on the previous 5.9-liter Cummins engine. The new diesel added a segment-exclusive exhaust brake, like over-the-road trucks use. The 6.7-liter motor not only met new 2007 EPA limits on soot emissions, but it reached 2010 NOx emissions requirements three years early.

On the gas-engine front, Chrysler replaced the Ram heavy-duty's legacy Hemi V-8 last year with the updated 383-hp, 400-pounds-feet-of-torque, variable-valve-timing version that debuted in the 2009 Dodge Ram 2500 and 3500. That Hemi is also carried over unchanged for 2010.

Good news for rock crawlers and wheelers: The Hemi-powered Power Wagon off-road version of the Ram also continues next year. It's the only Ram HD with a 4.56 rear axle and locking front and rear differentials.

What has changed for 2010 is almost everything above the Ram heavy-duty's carryover frame. The exterior has all-new sheet metal, and the interior is taken directly from the Dodge Ram 1500 half-ton. The front axle and suspension have also been improved.

"This isn't an all-new truck," said Scott Kunselman, Chrysler's vice president for the Jeep and Truck Product Team. "The 2010 Dodge Ram 2500 and 3500 are the next steps to improve our heavy-duty pickups."

Though they share the aerodynamic styling first seen in the 2009 Ram 1500, the heavy-duty trucks have taller, more-prominent front ends. It's a case of form following their primary function of towing big loads.

"The light-duty and heavy-duty Rams are significantly separated visually for performance and aesthetic reasons, and for better cooling," said Ralph Gilles, Chrysler's vice president of design. "The cooling we've gained for the heavy-duty we didn't have to do for the light-duty, which is why the grille is smaller on the light duty."

The Ram heavy-duty shares its headlamps and fenders with the 1500. The hood is differentiated to make room for the Cummins diesel. The front bumper has very aggressive stamping. It's a single-piece chrome bumper that wraps around the front fenders to give it a modern look and help aerodynamics.

Like last year's heavy-duty Ram, 2010 buyers will have three cab options, but the middle configuration has been changed. A two-door regular cab model remains, while a new four-door Crew Cab, with bigger back doors and more rear passenger space, replaces the previous, smaller four-door Quad Cab. A new 8-foot cargo box option (a 6-foot, 4-inch bed is standard) should make the Crew Cab Ram HD an attractive choice for fifth-wheel towers. "The Crew Cab has replaced the Quad Cab in the lineup," Kunselman said. "It gets an 8-foot box — a key part of the market we weren't participating in."

Though Dodge eliminated the Mega Cab option for its half-ton Ram, it's keeping the Mega Cab heavy-duty model with best-in-class interior space.

The inside features all the high-quality materials and ergonomic and infotainment options the Ram 1500 has, plus it adds a new integrated trailer-brake controller like Ford and GM offer in their HD pickups. The brake controller eliminates the need for an aftermarket kit to control a trailer's electric brakes for improved towing control.

The external rearview mirrors have also been revised to better facilitate towing. They can be pivoted horizontally or vertically depending on trailer size, and they have larger convex mirrors for better visibility. Turn signals are integrated.

According to preliminary towing and hauling figures, Dodge has raised the front gross axle weight rating from 5,200 pounds to 5,500 pounds on diesel 4x4 pickups, and from 4,700 pounds to 5,000 pounds on diesel 4x2 pickups. Gross combined weight ratings have been improved from 23,000 pounds to as much as 25,400 pounds on some 3500 models. Accompanying the increase in GCWR, max towing has also improved.

The sum of all these changes is a new Dodge Ram heavy-duty pickup that has evolved to better meet the needs of Chrysler's existing customers, and to take competitive advantage of gains already made meeting 2010's stricter and more expensive emissions standards. We expect both GM's and Ford's responses for 2010 to have significantly more power than the Ram HDs, but they'll also likely come with higher initial purchase costs relative to the new Ram than their current trucks are to today's Ram HDs.