Stock tire diameter is probably 27.5"
If you went to a 33" diameter, when you are showing 30mph you would really be going 36mph
Showing 50mph, real speed 60mph
Showing 60mph, real speed 72mph
2002 uses electronic speed sensor(VSS) so no gear to change, I think you still have the GEM unit behind the Radio, that is the unit that is programmed for trans, axle, and tire size to set speedometer, dealer can program that for you but they do charge for that, worth a call to see how much.
Other than that there is not much you can do, the speed sensor is also part of the ABS brake system I believe so adding a Dakota Digital interface may or may not work, but they are not cheap at $85
Universal Speedometer Signal Interface