if you are truly worried about your trans and performance taking a hit, get your axles regeared to 4.56

that will reset your final driveline ratio back to nearly stock. many many guys also report their MPG's in town going back up.

While you are in there, getting a traction adder wouldn't hurt. I myself am about to get my PSD regeared with a detroit rear, and true-trac front and 4.56 gears.




your highway MPG might take a 1 mpg hit...but then again, you are upgrading from 32" to 35" rubber. So your highway mileage is going to drop regardless. new gears will make it less so