* Door Jamb Sticker (or the glove box sticker): This sticker lists the vehicle's specifications, including the Gross Vehicle Weight Rating (GVWR). A half-ton Suburban will have a lower GVWR than a heavier-duty 3/4-ton or 1-ton model. The GVWR will be in pounds.
* Tire Size: Half-ton Suburbans typically came with smaller tires than the heavier-duty versions. Check the sidewall of your tires for the size. While not foolproof, comparing your tire size to known specs for 2006 Suburbans can provide a clue.
* Rear Axle: While not directly visible without some work, the rear axle ratio will often be lower on a half-ton model compared to a heavier duty one. This requires looking up the spec for your VIN (see below).
* VIN (Vehicle Identification Number): This is the most reliable method. The VIN contains a wealth of information about your vehicle's specifications. You can use the VIN to look up the specifications on sites like a Chevrolet parts site, or a third-party vehicle history site (many are subscription based). This will definitively tell you the model's GVWR and other specifications which clarify whether it's a half-ton. The VIN is usually located on the driver's side dashboard, visible through the windshield.
In short: The door jamb or glovebox sticker, along with a VIN lookup, are the most reliable ways to determine if your 2006 Chevy Suburban is a half-ton model. Looking at tire size can offer a clue, but it's not a guaranteed method.
