Hello, does anyone have a setup to share?

I'm currently using a slightly modded AS4 set but i have trouble to get the gearbox right. I think I must shorten it but each of my attempt as failed.

How do you find the right geabox setup? Is there another way that the "edit/trial" one ?


Edit: nevermind, the wr holder was kind enough to send me his setup. Thanks anyway ^^