* 4L60E four-speed automatic: This was the most prevalent transmission.
* 4 speed manual: A 4-speed manual was also available in some configurations.
To know for certain what transmission a *specific* 2001 Silverado 1500 has, you'd need to check the vehicle's identification number (VIN) or look at the documentation that came with the truck. The information should be on a sticker under the hood or in the owner's manual.
