Buicks use General Motors automatic transmissions, and there isn’t a single transmission that covers the entire Buick lineup. The exact type varies by model and year, with modern Buicks commonly paired with eight- or nine-speed automatics, while some older or smaller models used six-speed automatics.
As a division of General Motors, Buick shares transmission families with other GM brands. Over the decades the brand has moved from older four- and six-speed units to more recent eight- and nine-speed automatics, aiming to balance efficiency and performance across its crossover and SUV lineup. The following provides a general overview of how transmissions are configured across Buicks today and how you can verify the specifics for a given vehicle.
Current Buick models and transmissions
To understand what's in a specific car, review the model-year specifications; the list below reflects the general trend for contemporary Buicks, with exact speeds varying by engine and trim.
- Encore: modern configurations typically use an automatic transmission designed by GM, with eight- or nine-speed setups appearing in recent iterations depending on the engine.
- Encore GX: uses a GM automatic transmission, with recent years leaning toward eight- or nine-speed variants based on powertrain choices.
- Envision: generally paired with an eight- or nine-speed automatic, depending on year and engine option.
- Enclave: a larger Buick SUV that commonly uses a nine-speed automatic in newer generations, with some earlier versions using other GM automatics.
These examples illustrate that Buick’s modern crossovers and SUVs are aligned with GM’s newer automatic transmissions, most notably eight- and nine-speed units.
Historical context and transmission families
Buick’s transmission history traces GM’s broader evolution. Early Buick cars used GM’s Hydra-Matic transmissions, a lineage that evolved through multiple generations to include four-, five-, six-, and more recently eight- and nine-speed automatics. The current emphasis on eight- and nine-speed gearboxes reflects GM’s global approach to efficiency, smoothness, and performance across its mainstream brands, including Buick.
How to verify the exact transmission for a specific vehicle
Because Buick models span several generations and trims, the precise transmission designation can be different even within the same model year. To confirm the exact gearbox for a particular car, check:
- The window sticker (Monroney label) of the vehicle
- The official model-year specifications on Buick’s or the dealer’s website
- The owner’s manual or service manual for the transmission section
- The Vehicle Identification Number (VIN) with a GM service portal or dealer
These sources will reveal the specific transmission code and the number of speeds for that exact configuration.
Summary
In essence, Buicks use GM automatic transmissions, not a single unit across all models. Modern Buicks typically rely on eight- or nine-speed automatics, while some older or smaller models employed six-speed units. For precise details, consult the specific vehicle’s official specifications, window sticker, or a Buick dealership.