My dad just bought a 05 lly and it has a 5 position switch for the chip. But we can't find anything else
so.where should I start looking. Or what chip would this be? Thanks

 

what does the switch look like? is it just a plain black ****? sounds like a DSP5 switch, and if you cant find a module than thats more than likely what it is

EFIlive tunes the ECM without an extra module, and you can hook up a DSP5 switch to the ECM thats able to switch between the 5 tunes flashed into the ECM with EFIlive

 

Yeawe Tracked the po down and he said it was EFI Thanks for the help

 

yea and thats the best tuner for these truck btw.