Speedometer adjustment in Darwin after diff ratio swap?

[sss1600]

2.92 to 3.45 diff swap and the speedo is out now in a 2010 Ve v8 auto. Recommendations on who can fix this in Darwin? Can this be done simply with a Tech 2 like the older Vx LS1's? Do the auto shift points really need changing aswell? Have searched a bit. Some conflicting posts on here so am seeking recent advice. Cheers.

 

[07GTS]

the auto uses the speed for shifts so when the speed is back to correct it will also correct the shifts to correct, just the diff ratio within the tune needs to be set to the ratio u have now will fix it all