What is the towing capacity of a 2003 Chevy Silverado 1500 with 5.3 V8?

The towing capacity of a 2003 Chevy Silverado 1500 with a 5.3L V8 depends on several factors including the specific trim level, axle ratio, and whether it's a 2WD or 4WD model. There's no single answer.

You need to consult your owner's manual. The sticker on the driver's side doorjamb will also list the GVWR (Gross Vehicle Weight Rating) and perhaps the towing capacity, but the owner's manual is the definitive source.

Without that information, I cannot give you a precise towing capacity. However, expect it to be somewhere in the range of 7,000 to 9,000 lbs depending on the factors mentioned above. But again, check your owner's manual for the exact figure.