I don't think 30 will be any problem, even with a significant gear change--is yours a 5 speed "semi-auto"? I've been a little concerned with mine being an internal "auto" clutch and the initial hit from getting 800 pounds moving. Mine was originally 11-38 with 22" tires. I'm planning on 25s, so top end comes up with those offsetting somewhat a change in the initial and final drive gears. initial i'm thinking of going to a 14, the final has 32s already and i may "soften" it more if I can with the second jackshaft gearing.
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