2003 LB7 Duramax 5\
Diesel Power Products Is Your Source For All LB7 Duramax Performance Truck Parts! L GM Duramax equipped trucks unless otherwise noted. Overview of the L Duramax LB7 including the introduction of the Duramax future date (the L Cummins became a common rail for the model year. Blend Door Actuator for Chevrolet Duramax L LB7 LLY LBZ LMM Blower Motor Resistor for L Duramax LB7 LLY LBZ.