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  Dodge built the diesel-powered 2008 Dodge Ram 2500 to tractor-trailer-rig specifications to give the pickup's engine a lifespan of about 350,000 miles before its first overhaul. Cummins Inc. manufactures diesels for clients worldwide, including marine, stationary and big-rig powerplants. By utilizing big-rig specifications, service intervals are longer than standard light-duty trucks' diesel engines. Dodge also built the frame and body to accommodate the stress of a large engine.
  
  

Under the Hood

• The Dodge Ram 2500 HD's Cummins turbocharged, 6.7-liter, in-line six-cylinder diesel engine is larger than the 2008 Ford F-250's 6.4-liter V8 and General Motors' 6.6-liter Duramax V8. The Cummins engine generates 350 horsepower and 650 ft.-lb. of torque, which is the twisting force to give the truck towing power and acceleration, especially on steep inclines. A six-speed manual or six-speed automatic transmission complements the engine. The turbocharged engine employs an exhaust brake commonly found on tractor-trailer rigs to accommodate heavier loads and allow more controlled braking, particularly while traveling downhill. The exhaust brake also saves wear and tear on the normal brakes.
  
  

Diesel Performance

• The Cummins-powered truck, without a load, can reach zero to 60 mph in 9.2 seconds. The high torque output allows the truck to have a payload capacity of 5,130 lb. and a towing capacity of 16,850 lb. The engine requires servicing every 7,500 miles. The engine's lifespan is about 350,000 miles, while a standard pickup with a gasoline-powered engine generally has a 200,000-mile lifespan. Dodge designed the six-speed automatic to anticipate shifting torque with an empty cargo box as well as heavy loads. A manual switch allows the driver to shift into manual mode to override the transmission.
  
  

Dimensions

• The 2008 Dodge Ram 2500 HD diesel's curbside weight ranges from 6,100 to 6,600 lb., depending on the type of cabin. It comes in rear- and four-wheel drive. The cabin configurations are regular, extended and four-door crew cabs. The wheelbase ranges from 140.5 to 160.5 inches, depending on the size of the cab and cargo box. Its length ranges from 227.7 to 249.7 inches.
  
  

Option Costs

• The 6.7-liter diesel was an option in 2008. The standard engine for the 2008 Dodge Ram was the 5.7-liter gasoline-powered V8. The 6.7-liter diesel cost buyers an extra $495, although the exhaust brake was available at no extra charge. The diesel came with a five-year, 100,000-mile warranty.