Plastic speedo drive gear in gearbox 3.7 vs 3.9

[Phizinza]

This is something I should know but cannot remember, is the 3.9 diff ratio gearbox speedo gear smaller than the one in the 3.7 ratio gearboxes?

[El_Freddo]

Same size and interchangeable, different amount of teeth.

My theory is that they are the same in the Gen1 series 1 as the L series 3.7 ratio box - Subaru I reckon swapped the diff ratio to 3.9:1 to match the increased the tyre diametre and swapped to a better 5th ratio for the EJ22.
In the Gen1 series2 I think that's when the 3.7:1 ratio box appeared for the liberty.

Cheers

Bennie