For 3.55s, with an 8-tooth drive gear, and 275/60R15s:
Tire Height (in.) = 275 x 60 / 1270 +15 = 27.99"
# Driven Gear Teeth = 20.188114 / 27.99 x 3.55 x 8 = 20.46 ( use a 20-tooth, black gear)
But be prepared to still need a 21-tooth or 19-tooth gear for better accuracy, since no chart...