well i work at a GM dealer and was wondering when i install my 4:10's in my car, could a Tech 2 or any other computer dealers use be able to re-calibrate my speedo?

if not i guess i'll need to talk to pcmforless or Madz28. What else could a computer tune do for my car with the mods in the sig. i have a Manual fan switch also

 

No dealership tools will allow you to reprogram your gear ratio to 4.10.