someone on this board had a chart about tire size and gear ratio correlation, but i have no idea where it is now. 3.08's probably would be too high to use with 33" tires, IMO. I have 3.73's with 32" OD tires right now, and it seems to be a good medium between performace and fuel efficiency (lol).
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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