Looks like I am going to try to resurrect an old thread- this is exactly what I am thinking of doing as well, I hate driving down the freeway at 3100RPM... and my family will not put up with me not doing the speed limit... my wife's POJ Hyundai Elantra gets better MPG at 70 than my civic, and that's just wrong
Could you really just drop a CX or VX tranny in the civic? how smart is that for longevity? My civic only has 125K right now, and has never been changed from stock. although I plan on keeping it forever.
What about that elusive gear swap for 5th gear? that seems smart to be able to leave everything the same except for the 5th gear. Do you have to take the whole tyranny out, or can you get in there to swap them? another thought, I can easily skip 4th when accelerating, what about moving the 5th gear to the 4th gear and adding an even taller '6th gear' in the 5th position? Does anyone know all the details on this kind of thing?