You're right, the main thing I was asking was if it was overdrive, though knowing the true ratio is good too (I do have oversize tires, now I can figure out my true speed -- that is, if I believe my tach...

Anyway, on that pirate site, there's a discrepancy which is probably a typo:
AX5 - 1st gear is listed as 3.93
AX15 - 1st gear is listed as 3.83

since all the other gears are the same, is this a typo (easy to hit 8 instead of 9 or 9 instead of 8) or does the AX5 actually have a lower first gear?

BTW, the other site posted above (from jeeptech) lists 3.93 for AX5 and 3.83 for AX15, also AX15 has a higher rev gear (4.22 instead of 4.74)