Maybe the layout of the gearbox itself? Because the engines have different caracteristics it is possible that the layout of the gearbox is completely different. That is the best answer I could think of :lol:
Dr. Bob is correct. The internal gearbox layout dictates this. Did Ferrari design the gearbox for the 456 GT or was it farmed out to another firm like X-Trac? This may the deciding factor. They (X-Trac or someone else) may have had a gearbox application that could be directly used for the car and thus saved Ferrari the development money.
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