Gear box: It is the place where the different "gears" of the cars are located.
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There is a shaft that comes from the engine and then there is another one that comes out of it and goes to the wheels. Through a set of gears, it moves at different speeds even when the engine moves at just one constant speed, so it takes advantage of the engine's power. They may be manual or automatic.
When I try to get my car moving, I need at least 1600 RPM for the car to not shake at straight road. When i try to go normal quet start (1200-1500rpm) before releasing the clutch, my car vibrates , like it's going to stall. Can you guys help me ?; also it gets worse when the car is heated after highway and traffic. When the car is cold it barely shows the problem.