GMPartsGiant.com offers the wholesale prices for genuine 2021 Chevrolet Trailblazer 2WD parts. Parts like Automatic Transmission Output Carrier Transfer Drive Gear Hub Assembly are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 3 Cyl 1.2L, 3 Cyl 1.3L. Model Code: 4 DOOR EXT.