id honestly say 3.43 just because the 4.3L and i wouldnt go lower that 3.23 for sure. youll get worse mileage with the engine having to strain harder while pulling with anything lower. even if its just a tiny boat. my friends truck used to switch between gears on every overpass when pulling a small trailer because of that and that ate the fuel like crazy. itll be much worse if you ever plan to drive in some hills like toledo bend area
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