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Parts & Accessories For 1998.5-2002 Dodge Trucks with 5.9 Diesel Engines
For the second half of the 1998 model year Dodge made some major mechanical changes to the diesel-powered Ram pickup trucks. Often referred to as a 1998.5, the updated 5.9L diesel now featured 4 valves per cylinder, for a total of 24 valves. In addition, the mechanical injection pump was replaced with a VP44 electric pump. XDP offers a wide variety of stock replacement components and upgraded parts to help keep your 1998.5-2002 Dodge Ram 2500/3500 on the road.

Videos for 1998.5-2002 Dodge Ram Trucks with 5.9L Diesel Engines

For the second half of the 1998 production year Dodge made some major mechanical changes to the 2nd generation trucks. These trucks would maintain their signature body styles but would be powered by a modified version of the 5.9L diesel engine. Improving horsepower and torque is always one of the main objectives for competing diesel engine manufacturers, which influenced the production of the 24-valve. One key upgrade to the 5.9L was doubling the number of valves in the cylinder head to 4 valves per cylinder. The combination of increased valves and an enhanced fuel system would significantly increase airflow, provide more precise fueling, and reduce emissions, all while delivering more horsepower and torque. Paired with the new 24 valve engine were new drivetrain components to further improve overall performance.

Maintaining durability was another major focus when redesigning the 5.9L engine. The cast-iron block and cylinder head proved they could handle increased power. Utilizing 4 valves per cylinder gave the 5.9L enhanced throttle response and a broader torque curve. The upgraded cast-iron 24 valve cylinder head significantly improved coolant flow in the engine. The forged-steel crankshaft and connecting rods were carried over from the 12-valve engine due to their durability and longevity. To increase performance and reduce emissions components in the fuel system were upgraded. The mechanical injection pump was replaced with a Bosch VP44 electric pump. With an integrated ECU the Bosch VP44 injection pump pressurizes fuel, controls injection timing, and monitors fuel flow. While the injection pump on the 24 valve is electric, the injectors remained mechanical. These high-pressure mechanical injectors were redesigned to inject fuel into the center of the piston. With the new centrally located fuel injectors, the cast-aluminum pistons fuel bowls were redesigned to match the injector's new spray pattern.

For the 1998.5-2002 model years the 5.9 diesel was paired with the same 47RH 4-speed automatic transmission as the 12 valve, but a new 6-speed manual transmission was paired to the 2nd generation trucks. The NV5600 6-speed transmission allowed for extra horsepower and torque on the 24-valve. From 1998.5-1999 trucks paired with an automatic transmission were rated at 215 hp and 420 lb-ft of torque, which increased to 235 hp and 460 lb-ft of torque from 2000-2002. The 2nd generation trucks paired with a manual transmission were rated at 235 hp and 460 lb-ft of torque between 1998.5-2002. In 2001 Dodge introduced the high-output 24-valve configuration, that featured the NV5600 6-speed manual transmission, upgraded fuel injectors, and an upgraded VP44 Pump. The high-output version of the 5.9L diesel was rated at 245 hp and 505 lb-ft of torque. The 24 Valve 5.9L is still supported by XDP and a wide range of other aftermarket manufacturers. For the simple service jobs on your truck XDP has the Fuel Filters, Oil Filters, and OEM quality fluids you need. When it's time for engine work, find the Gaskets & Seals, Head Studs, and other Engine Parts your 5.9 diesel needs. Get the most out of your 24-valve diesel and increase horsepower and torque with Performance Fuel Injectors, Turbo Upgrades, and Fuel Lift Pumps. XDP has the parts to keep your 1998.5-2002 Dodge 5.9L 24V Diesel on the road.