Re: G5M Transmission upgrades?
There are only a handful of G-series parts. All of them are hard to find.
I rebuilt my Fusion tranny 2 months ago, and it's holding up better than my Probe/Escort/Protege's GxM. Ford certainly did use a better shaft, syncros/gears, and a stronger case on the Fusion. Unfortunately, the gear ratio would be hell to change, just because the strength of what we have now, is as good as were going to get, without getting custom made parts. I know the early Mazda3 turbo guys did have a 3rd and 4th made from .... gah, I cant remember the company off the top of my head. Good luck trying to purchase them, when I called 2 years ago about it, they were not interested in making any more, or dealing with the g5m.
The a6 is where it's at right now, and like benit0 said, the MTX75 already has such a good aftermarket, that the G-series was left to rot.
BTW, I rebuilt my tranny more out of curiosity. I don't know about your luck, but mine is really holding up well.
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