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I need to jump on this taller 5th bandwagon.
I had a taller 5th gear on my Mirage. I honestly didn't like it. It was a F5M33 trans with a AWD 5th gear, which is a direct bolt-in affair. It lowered the RPM's so much that the car fell of its powerband in highway cruising, and I had to give it a lot of gas to pass people and things like that. The fact that the engine was lugging out of its powerband, and the fact that I had to give it more throttle to get around things, meant that my gas mileage didn't really improve any, if at all. I honestly hardly noticed a difference from the stock KM210. The F5M33 trans I installed already had the AWD gear put in when I installed it, so I can't tell you what the normal F5M33 5th gear was like. I will admit, it is nice cruising at lower RPM's in general. It's less noisy and vibrationy, but that's about it.
I just want to cruise at lower RPMs sometimes I drive about 75mph and it's screaming, it's enough to make the temps go up. Don't care about power band, that's what downshifting is for.