KZ Camping Man

If you have the factory tow package you will have the 3.42 rear axle ratio. The best way to tell is by the RPO codes. There is a decal in your glove box that has all the RPO codes for you vehicle. Take a picture of it and go online and look up 2013 Silverdo RPO codes. You will be able to tell everything from ratios to cooling and so on all valuable info for towing.