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What are you trying to gain by doing this? It will hurt towing, you won't take off as quick. 3.42 and 3.73 are so close that I wouldnt even consider it, your mpg probably wont even increase anything noticeable..
 

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saw a write up in one of the mags. they said cost savings in mpgs would be seen in about 15,000 miles.
 

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why not go to a larger tire. Makes the effective gear ratio change.
 
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