After changing from 235 75 r16 to 265 75 r16s I have really noticed a change in how fast i am actually going to what the speedometer shows. I was wondering what adjustment could be made and how. And if I need some sort of tuner what would be the best bang for my buck. I really don't care about adding few extra miles to the odometer because I am and will be the last owner of my truck.

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98' 4x4 off-road 3.0 5-speed stock height(for now) 265-75-R16's
"If you want it done right you better do it yourself"