* Engine: The 4.3L V6 had a higher towing capacity than the 2.2L four-cylinder.
* Transmission: Automatic transmissions generally allowed for higher towing capacities than manual transmissions.
* Axle Ratio: Trucks with higher axle ratios (e.g., 3.73 or higher) could tow more.
* Package: Certain options and packages added features that might affect towing capacity.
To find the exact towing capacity for *your* 2003 Chevy S-10, you should:
1. Check the sticker on the driver's side doorjamb: This sticker lists vital information, including the vehicle's GVWR (Gross Vehicle Weight Rating) and often the towing capacity.
2. Consult your owner's manual: This manual will specify the towing capacity based on your truck's specific configuration.
Without knowing the precise engine, transmission, and options of your specific 2003 S-10, it's impossible to give you a precise number. Expect the range to be somewhere between around 3,500 lbs (1588 kg) to perhaps 5,000 lbs (2268 kg) depending on the configuration, but always check the documentation of *your* vehicle.