2001-2002 Silverado 2500 HD (submodel: Base, LS, LT) DIESEL, transmfrcode: 1000/M74, transmfr: Allison, It Fits the Model With Allison Transmission, With 1000/M74 Transmission. 2001-2002 Silverado 3500 (submodel: Base, LS, LT) DIESEL, transmfrcode: 1000/M74, transmfr: AllisonGMC.
