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03TahoeHawk, there is a sticker in your glove box with a list of codes; those codes will tell you what options you have including what gear ratio. You can find the code list online with a simple Google search

I have an 04 w/3.73; I regularly tow a 4,000# RV w/no problems in the eastern mountains. Towing a 19' boat should be no problem even with 3.42 gearing. Poppasmurf; the only Chevy full size SUV, according to the owners manual, that can tow 10K plus is a Suburban... towing that much weight with...

If you swap the head end you can get adapters to utilize the existing Bose system while keeping the steering wheel controls; and it will sound great. The Bose system uses amplifiers at each speaker; aftermarket head units make them sound a lot better.