Quote:
Originally Posted by cRiPpLe_rOoStEr
Most of the times a 6th gear is worthless at all, and sometimes a 5-speed transmission may actually lead to a better mileage compared to a 6-speed. But anyway, instead of a taller 6th, if I had the choice I'd get a wide-ratio transmission with a higher gear spread and match it to a higher differential.
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Yea I'm doing the opposite in the Miata. I'm doing a really short geared 6-speed swap (gears 1-6 are actually shorter than the 5 speed 1-5), but I'm pairing it with the tallest rear end available for the NA Miata (3.63 instead of 4.1) So my 1-5 is the same ratio as the 5-speed with 4.3 rear end, but 6th gear is a true overdrive and makes driving the car a dream. My RPM will drop about 500 over the 5-speed with 4.1 (from 3636 at 75 to 3150(ish), and 750rpm over the 5-speed with 4.3.