Help - FJ25 Speedo Calibration

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Archie 1962 FJ25

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We all know that stock tyre size on FJ25 was 600 X 16 which is 28.8 inch in diameter and now I got 7.50 R16 tyres which is just over 31 inches in diameter. So what drive gear & driven gear we have in FJ25 transfer case and what do I need to do to achieve correct calibration -

1) Do I need to change drive gear?
2) Do I need to change driven gear?
3) Do I need to change both?

Please advise and part numbers. I am assuming we can still buy both gears for transfer case from Toyota. I found following picture posted by @IDave in another thread in 40 forum.

Speedo Calibration Gears.webp
 
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