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The 5th gear ratios are different.
Zenki FC3S turbo 5th gear = 0.862
Kouki FC3S turbo 5th gear = 0.819
BTW, the FD3S runs the same 5th gear ratio as the Kouki FC3S turbo.
I don't know what you're trying to do, but the FC versus FD trans are totally different beasts.
The dimensions are different, and they do not swap in terms of mounting.
-Ted
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