Year One 17 Inch Snowflake Driven Gear Recommendations?

[MS79Y84SE]

Year One 17x9 inch wheels with Nitto 275/40ZR17 102W, TH350 automatic, 308 gears in rear end.

Is anybody running this combo?

What gear set are you running, drive, and driven to correct the speedometer issue, being approximately 20 mph off on the fast side?

 

[Aus78Formula]

It depends on what you have now and the diameter of those new ones.

20mph off at what speed?

It is easy to calculate what you need, but you also need to know what you have now, and in speedo gears, assume the correct prior.