good to know. However, isn't the 265/65/18 a 31.5" tire? whereas the 255/70/18 is a true 32" tire? apparently, from what I have searched the final 0.5" is what causes issues and the 255/70/18 apparently will not fit in the spare wheel well out at the back.I Ran 265/65r18 (32") for years and no gearing problems.
255/70r18 is only a 10" wide tire.
Thats almost an inch (8%) narrower and will help prevent a lot of rubbing.
Tire Tech Information - The Wheel Fitment, Tyre Stretch, Rolling Radius and Speedometer Error Calculator. Play with specs, try different settings, compare resultswww.wheel-size.com
did you run your 32" without any lift? as in bone stock suspension ?