FINAL DRIVE :

All about engine:yes some part it happens to include in the final drive as like drive pinion _and tel pinion and ring gear and crown wheel. So the engine power and speed is shared in the 90° angle by final drive without any permanently gear reduction. And the tel pinion are round by propeller shaft. And crown wheel are round by tel pinion and it happens to gear deduction as soon as runs the crown wheel. For example. The tel pinion and crown wheel ratio is not same so if tel pinion runs 2500 round then it will be possible to do run the crown wheel til 365...