Originally Posted by CDN SS

I have 2010 LTZ CC truck 5.3 6spd blackbear tune with 4.11 and 32.6 tires tow an enclosed car trailer loaded 7000lbs base your rear gear on the hwy speed/ rpm you want BASED on towing in 5th gearif he going to tow a bigger trailer ...you wont be in 6th much I tow @ 2500 rpm in 5th @70mph

If he wants to tow in 6th then will need 4.56 at least but non towing hwy mileage will drop if he cruises over 2k non towing