Reprograming Speedo with these set up?

[nanyiru]

Im about to change my 2nd gen xlt 96 awd stock tires, i bought a 31x10.5r15 red lettered grabbers, do i need to reprogram my speedo for these new set up?


My concern is the shifting bug that generates a biger tire set up but i dont know if its necesary to change anything else or with the stock set up works good?

These is my daily ride, almost all the time on city driving .

 

[B2-Bomber]

I had a 1998 5.0 awd with 31s on it. I did not change the speedo. worked fine. the speedo read a couple percent slow, but mechanically the rig ran fine

 

[nanyiru]

Cool, so i don´t need to spend more $$$ feeew! Thanks B2-Bomber!