* Check the sticker: Look for the sticker on the driver's side doorjamb or the glove compartment. This sticker will list the GVWR for that particular truck.
* Consult the owner's manual: The owner's manual will also specify the GVWR.
* Use the Chevrolet website: You can use the Chevrolet website's build and price tool, selecting the year and specific trim level of your 3500 to find the GVWR.
Without knowing the specific year and configuration of the truck, it's impossible to give you a precise GVWR.