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The problem with 4.30 gears is what about when you are not towing? That is way to much gearing for anybody. When they build your truck they match the gears in the transmission to the drive gears. Changing them will only mess up the ratios and may damage the transmission. Not to mention the higher RPM's at highway speeds. Just stick with what you have. I have the diesel with 3.31's and it does just fine. I see no reason to change them to 3.73's
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