Here's the formula again (from my memory), when I get home I'll check the
printout to make 100% absolutely sure.:
# of teeth = (265 X Axle Ratio)/ tire diameter.
Example1 # of teeth = (265 x 3.55)/ 28 = 33.6 ==> rounded to 34
teeth.
Then, the number of teeth becomes the last two numbers in the pinion gear
part #.
Hope this helps.
SteveM.
P.S. - I have also made a tire size calculating spreadsheet which can also
calculate "effective gear ratio". Example - Changing from stock 235/70/15's
to 245/50/15's is like going from 3.55 gears to approximately 3.90 gears,
assuming you had 3.55's to start with.
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