i have the quadzilla stealth 2 on my 01 duramax. there is an adjustment you can make on the programmer about the gear/axle ratio. do i adjust this or leave it alone. also, my speedometer isnt corrected even when i set it for my 33" tires. anybody had this before or know what to do?-thanks

 

gear axle should be 3.73 leave it at that if it isnt already.

if you move on after that screen is should ask if you want to calibrate for bigger tires, then slect yes and change to the correct size.

 

 

ya don't touch the gear ratios unless you have changed them out the truck came with 3.73 from the factory