Chassis ECM Transmission Automatic Fits 01-05 SIERRA 2500 PICKUP 1174378
SIERRA 2500 PICKUP 01-05 Transmission; (LH fan shroud), (AT, 5 speed, Allison, opt M74). SIERRA 3500 PICKUP 01-05 Transmission; (LH fan shroud), (AT, 5 speed, Allison, opt M74). SILVERADO 2500 PICKUP 01-05 Transmission; (LH fan shroud), (Allison, AT, 5 speed, opt M74).