To find the exact towing capacity for *your specific* 1998 GMC Sierra CK1500, you should:
* Check the sticker: Look for the sticker on the driver's side doorjamb or inside the glove box. This sticker will list the GVWR (Gross Vehicle Weight Rating), GAWR (Gross Axle Weight Rating), and often the towing capacity specific to your truck's configuration.
* Consult the owner's manual: Your owner's manual will have a section detailing the towing capacity and other important information related to towing.
Without knowing the specific configuration of your truck, it's impossible to give you a precise towing capacity figure. However, you can expect it to be in the range of approximately 7,000 to 9,000 lbs, but this is just an estimate and could be higher or lower. Always rely on the information found on your vehicle's documentation.