i just bought a 1997 2500 wit 5.9 gas and it came wit a hyper tech tunner im tryin to figure out how to adjust my tire size i adjusted the fuel but it dont have intructions for adjusting tire size it has adjustment for top speed for high performance tires but i dont think thats it does anyone kno if i can adjust my tire size on the hyper tech tunner?

 

You have to replace the gear on the transfer case to adjust speedo on a 97.
98+ is electronic adjustment

 

thanks man does ur truck grind when u put it into 4lo and back into 4 hi from 4 lo?

 

a little bit
I usually go from 4 low strait to 2wd then back to 4 high though.
There is a thread about this going onright now.