The 4.10 gears have been in now for 5 days and I haven't noticed any diffrence in my fuel economy,although it hasn't been checked accurately. My car has a auto and it had 3.73 gears,runs a little more rpm than I like on the freeway,I'm sure it wouldn't be near as bad with a 5 speed. The 4.10 gears do accelerate much harder out of the hole,3.90 gears are a nice compromise.
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