I have 4.56 gears in my 2007 S331 and I consider it the best modification that I have done to this truck. At 75 mph it tachs about 2600 rpm. With this gear change, there isn't that gear hunting back from overdrive to third gear like it does with the 3.73 ratio. It makes the truck feel lighter then it is and has good bottom end performance with these 23 inch wheels and tires.
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