This Dodge 5.9L Cummins common rail fuel injector is designed to replace Bosch 0986435503 on 2003–2004 Ram 2500 and 3500 trucks with the 5.9L ISB diesel engine
Engine & vehicle application Fits 2003–2004 Dodge Ram 2500 and Ram 3500 trucks equipped with the 5.9L Cummins common rail diesel engine. 
Replaces Bosch part number Designed to replace Bosch 0986435503 (crosses with 0 986 435 503 and related Cummins references commonly used on early 5.9L common rail engines). 
Helps fix common injector symptoms Can help address issues like hard starting, white smoke, rough idle, ticking/misfire, and loss of power caused by failing injectors. 
Precise common rail fuel delivery Built to deliver consistent fuel pressure and spray pattern for smoother idle, better throttle response, and more stable towing performance. 
Direct-fit replacement Designed as a direct replacement injector for the factory 5.9L Cummins common rail system—no custom modifications required when used in the correct model years. 
Installation recommendation For best results, it is recommended to install new injector connector tubes and keep the fuel system very clean during installation to avoid contamination-related injector failure.