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Unfortunately, the 6 speed C series has very short differential gearing (C60 is 4.529:1, C62 is 4.312:1). So, even though you get an extra gear, it doesn't help in on the top end. All the 6th gear ratios I have say they use a .725:1. Almost all the 5 speeds use a .815:1, although some use the .725:1.
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