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  1. 2007.5 + (GMT 900) Non Powertrain New Body Style
    I have a 2007.5 crew cab long bed 2WD 6.6 with the Allison 6 speed. The truck came with the small 245/75/16 tires. I want to put a little bigger tires on when these wear out. Is the truck set up to run this size for the best mpg or can I go a little bigger and not hurt mpg? I plan on keeping the...
  2. Wheels & Tires
    I have a 2007.5 crew cab long bed 2WD 6.6 with the Allison 6 speed. The truck came with the small 245/75/16 tires. I want to put a little bigger tires on when these wear out. Is the truck set up to run this size for the best mpg or can I go a little bigger and not hurt mpg? I plan on keeping the...
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