Re: 2.3L vs 2.4L
The trannys will shift at high RPMs even stock. They just have to be in perfect working order and you have to be a good driver. Shep was shifting his setup at 10k plus on the same tranny he sells to his customers. Actually his tranny was underbuilt compared to some with an example being JETS tranny, its built up more than Shep old one. Now that he runs a dogbox its a mute point. But it can be done. The reason you see people shredding shit about 8500 is because the tranny isn't in perfect working order when they are doing it and or they don't know how to shift properly and they end up breaking shift forks.
As far as the power comment. That should be self explanitory. Jet covered that one.
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