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Rear end gearing help.

I'm writing some matlab stuff for my engineering class that will analyze the performance and economy of different rear end ratios in both cars and trucks. What kind of gear ratios are wanted in trucks? Lower = more torque so more off road? Higher = ? And what values are you looking for for offroading (4.11? 3.08?) Basically I have two functions, one speaks about performance (probably offroad in this case) and the other speaks of fuel economy (will probably be the same as a car).


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