Questions about Transmission Tuning

[Techy]

I'm not sure if this subject pertains to this sub-forum, but I think it strictly deals on tuning so.., I have 2 questions about transmission/gear ratio tuning, and I'll appreciate anyone answering them

Question one is what's the difference between the last gear (...4th, 5th, 6th, 7th gear) and the Final Gear (just says Final Gear)?

And question two pertains the reference graph: The x-axis measure time and the y-axis measuring the RPM, correct? I asked this because whenever I modify the gear ratios, sometimes the reference lines moves close to a neighboring gear according to the gear ratio you set, like a higher ratio = closer to the next gear.

 

[Adrenaline]

Final gear, is effectively like a 'rear end' in a normal RWD car.
Low numbers are high top speed, high numbers are low top speed, faster acceleration.

The graph is RPM vs MPH I believe.

 

[zodicus]

and the red line at the top is the redline of the car (the red area of the tach) and the top of the graph is max rpm.

 

[CarCzar]

The way I think GT5 did it is like this. The actual gears e.g: 1,2,3,4,5,6 are all individual gears. As the "Final Gear" Is the actual drive gear completing the ration between the Transmission and the Drive Gear. That;s my understanding of it. If only I could tune the thing