* 4-speed automatic: This was a common option, especially with some of the lower-powered engines.
* 6-speed automatic: This was also available, particularly with the more powerful engines.
To know the specific transmission in a particular 2010 Silverado 1500, you'd need to check the vehicle's documentation (owner's manual or sticker on the driver's side doorjamb) or the vehicle's identification number (VIN).
