2007 GMC 1500 4x4 tire size reduction.
I am needing to increase my torque (towing power) on my truck to pull a 28 ft 5th wheel RV with a dry weight of 7,900 pounds. 2007 GMC Sierra SLE 4x4 4.8L V8 The factory tire size is P265/70 R17 (31...
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I changed the rear end gearing in my truck in hope of having more pulling power up hills. I was able to jump the speed up the same hill by 10MPH but my gas mileage went from 8MPG to 6MPG when towing... and when not towing the mileage went from 10 to 8MPG.
Not worth the effort.
Not worth the effort.
