Fastening aston martin Wrong Steps

Wrong steps to fasten Aston Martin: wrong, not wrong, the most critical differential and shift gearbox of mechanical group. The shift gearbox needs to be tied up with rubber bands. When we get there, I wonder if this thing is very important. Why did it fall there without any parts connected? Should it go up or down? A mystery? I don't care. I found that the direction of the rear wheels was inconsistent, thinking that there was something wrong with the differential. It is clear in the picture that even if I can't shift gears, there is a great god who says that the other two gears have great resistance. I don't know which direction to go.