S197 3V Change final drive on stock tune

[flash_xx]

Hi,
I plan to get rid of my intake and sct tune and put back the stock tune. Thing is I switched to 3:73 gears. What tool can I use to change the ratio without tuning car?

 

[Mad Hatter]

If you have a SCT device to put back the OEM tune then you can change the ratio. Basically whom ever puts the OEM tune in can change the ratio.

 

[EF1]

The SCT tuner lets you change without loading custom tune. You could also change with forscan.