The actual tow rating changes for each gear option for the truck. I found that out in my owners manual, in my 07 the standard was a 3.42 I think, but mine came with upgraded 3.73 gear, this is about 1000lb more capacity, it is like 7500lbs for my 1500 with the 4.8 liter.
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2010 Surveyor 28 BH
2007 Chevy Silverado Classic
4.8 with Bully Dog Gas Tuner and 3.73 gears
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