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The only set of 3.90s I can think of are made by Motive and they are said to whine so I would just skip them and go with 4.10s. 4.30s Are cool if you don't do much hwy driving. 4.10s are alright for the hwy though. I run about 2700-2800 rpm at 80 mph and my fuel mileage loss is negligable.