* Engine: A 6-cylinder would weigh less than a big-block V8.
* Options: Power steering, air conditioning, and other options added weight.
* Trim level: Higher trim levels often included more features and therefore weighed more.
* Payload: The weight of anything in the truck bed is added to the curb weight.
To find a reasonably accurate estimate, you'd need to know the specific engine and options of the truck. Even then, it would be an estimate, as individual build variations existed.
Your best bet would be to:
* Consult a 1978 Chevrolet Silverado brochure or owner's manual: These often list the curb weight (weight of the vehicle without passengers or cargo) for various configurations. You can sometimes find these online through sites like eBay or specializing in vintage car manuals.
* Use a vehicle specification database: Several online resources specialize in vehicle specifications. However, finding exact data for a specific build of a 1978 truck might be difficult.
In short, while you can't get a precise weight without more information, expect it to be in the range of 3000-4500 pounds (1360-2040 kg), with the lighter end representing a base model with a smaller engine and the higher end a heavier model with options and a larger engine.
