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Ontario | as far as fuel economy it's not enough to even think about. there's 3.21, 3.55 and 3.92 and the difference between the 3.21 and 3.92 is like 1mpg. there's also not a huge difference in towing ability because the 8 speed already has a very low 1st gear but if you're pulling a lot of heavy loads the 3.92 will get it rolling easier and the transmission won't shift as much to maintain speed
Edited by Andy578 6/30/2016 23:11
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Dodge eco diesel gear ratio
