I would like to clear something off my mind.
How do we actually calculate the needed ratio for the car.
As I do know , we cant change the final drive of the transmission of a 4WD car as they would not synch with the rear of the car like how we do on the Honda FWD's.

But how does Shep , MFactory and TRE do it. How do we make the ratio's longer or shorter. I would like to theoretically understand it . How does the calculation go.

 

Huh?

Why not?

Transmission -> Center Differential -> Rear Differential and Front Differential

They just change the transmission output drive gear and the transmission output shaft to the drive gear.

 

The final drive is completely in the transmission. The diffs are merely changing direction and nothing else. They have a ratio for sure, but its not doing anything. The T-case is actually a 3.307 overdrive the rear diff is 3.307 reduction so that the trans FD is maintained as the actual ratio.

Here are some pix of how it works-

https://www.evolutionm.net/forums/ve...rpm-60mph.html