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Aisin Automatic Transmission shift kit?
I have an Aisin AF-23 automatic 5-speed in a 2003 Saturn ION. The transmission in these cars has always been one of the biggest complaints among its owners, and, given the performance difference between the Aisin 5-speed and the 4T-45E Hydramatic 4-speed in the 05+ models, it's obvious that the motor isn't what's holding this car down the most. (It's sad: Some sources are quoting 0-60 time differences on the order of 2 seconds.)
With all that said, I've seen "shift kits" throughout the Internet that promise quicker and more solid shifts, and, despite what I would think, better transmission reliability, but I've yet to find one for this particular transmission.
1. Where can I get such a kit for the Aisin AF-23?
2. Why would Aisin design a transmission with less-than-optimal reliability AND performance?
3. How does a shift kit actually work? What parts are replaced/improved?
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