Your truck's tow rating is based on axle ratio. For 2015, per Trailer Life Towing Guide, depending on specific model, the 3.31 axle is good for 9k lbs, the 3.55 is rated around 10k lbs and the 3.73 ratio rated around 11k lbs. If the truck is out of warranty and 2WD, cost to have a speed shop swap gears may be worth considering. Will make for more comfortable towing. Even if your truck model doesn't have a factory option for the 3.73 ratio, it is still an option.
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Larry Day, Texas Baptist Men volunteer
'13 Silverado LT 3500HD D/A CCSB 2wd, custom RKI bed
'19 Starcraft Telluride 292RLS
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