1989-1993 5.9L Cummins

The 1989–1993 5.9L Cummins, the first-generation engine that started it all. This is the one that put diesel pickups on the map — simple, mechanical, and nearly indestructible.

Our catalog of 1989–1993 Cummins 5.9L parts includes everything from OEM-quality maintenance components to performance upgrades for restoration builds and daily drivers. Popular products include VE injection pump rebuild parts, injectors, turbochargers, exhaust manifolds, and upgraded fuel delivery components from Industrial Injection and BD Diesel. Many first-gen owners also choose South Bend or Valair clutch kits for manual trucks, AFE intake systems for better airflow, and Pacbrake exhaust brakes for improved towing control. We also stock filters, sensors, gaskets, and cooling system parts to keep your 12-valve mechanical Cummins as reliable as the day it left the factory.

Whether you’re restoring a first-generation Dodge Ram, maintaining a workhorse that’s still pulling weight, or building a nostalgic performance project, Thoroughbred Diesel has the parts and expertise to keep your 5.9L Cummins alive and well. Shop trusted brands, browse by category, or explore featured products below — everything you need for your 1989–1993 Cummins is right here.

The 1989–1993 Dodge Ram 5.9L Cummins was the beginning of a legend. As the first Cummins-powered Dodge truck, this 12-valve engine revolutionized the diesel pickup market with its durability, efficiency, and unmatched torque for the time. Featuring a mechanically driven VE rotary injection pump and rugged internals, the first-gen Cummins quickly earned a reputation as one of the toughest engines ever put in a pickup. Thoroughbred Diesel proudly supports these classics with a full selection of 5.9L Cummins parts and upgrades to keep your first-generation Ram running strong for decades to come.