The 2015 Silverado 1500 used two main automatic transmissions across its lineup: a six-speed automatic and an eight-speed automatic. The exact transmission depends on engine choice and configuration.
Overview of transmission options
Here's how the transmissions break down by engine in the 2015 Silverado 1500.
- 4.3L V6 EcoTec3 — typically paired with a six-speed automatic transmission.
- 5.3L V8 EcoTec3 — usually a six-speed automatic, with an eight-speed automatic available on certain trims/configurations to improve fuel economy.
- 6.2L V8 EcoTec3 — commonly equipped with an eight-speed automatic transmission.
Availability can vary by trim level, drivetrain (2WD vs 4WD), and production date. For an exact match, check the window sticker or the vehicle VIN.
How to confirm your specific truck’s transmission
If you need to confirm for a specific vehicle, refer to the owner's manual, look for the transmission code on the build sheet, or consult a dealer with the VIN to pull the exact transmission specification.
Summary
The 2015 Chevrolet Silverado 1500 used two main automatic transmissions. The six-speed automatic covered the base 4.3L V6 and many 5.3L configurations, while an eight-speed automatic was available on select 5.3L and most 6.2L configurations, providing improved efficiency on the highway. Always verify for a given vehicle, as options varied by trim and drivetrain.