GMPartsGiant.com offers the wholesale prices for genuine 2021 Buick Envision 2WD parts. Parts like Automatic Transmission Front Differential Carrier are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.0L. Model Code: 1SC 4 DOOR SUV, 1SL 4 DOOR SUV, 1SV 4 DOOR SUV.