Tire diameter can effect your RPM's. I would need to know your final drive ratio to tell you which size tire would do best. Bigger tires will bring your Cruising speed down but also your performance. Here is the formulas you can use to figure it out.
RPM = mph x gear ratio x 366
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tire diameter
tire diameter = mph x gear ratio x 366
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rpm
Plug in the numbers you have and the numbers you'd like to have. Then you can decide what is possible. Changing tire sizes will effect your speedometer reading also. Larger tires will cause the speedometer to show a slower than actual speed. Good Luck
If you change the tire size it won't be a dramatic difference. Probably only a few hundred rpm's at most per one inch increase. On a four wheel drive truck you must change both front and rear axle gears together if you decide to take that option. It can be an expensive endevor changing gears. I personally don't recomend it.
Good Luck.
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The only way to accomplish that is to change the axle gear ratio. Trucks are generally geared for hauling, towing, plowing, etc, so you have more torque and power at lower speeds. If you change the axle ratio,your low end performance will probably suffer (sluggish acceleration at low speed). Basically, your T100 is not designed for 70mph highway driving.
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