To find the GVWR for *your* specific 2008 Chevrolet Tahoe, you need to:
* Check the sticker: Look for a sticker on the driver's side doorjamb or the glove box. This sticker will list the GVWR along with other important weight ratings.
* Consult your owner's manual: The owner's manual will also specify the GVWR for your vehicle.
Without knowing the specific trim level and options of your 2008 Tahoe, I cannot provide the GVWR.