1. Linkage: It is possible that the linkage between the gearshift lever and the gearbox is damaged or worn out. This can prevent the gearshift lever from moving into the correct position, causing the car to get stuck in 3rd or 4th gear.
2. Gearbox: If the gearbox is damaged or worn out, it may not be able to engage the gears properly. This can also cause the gearshift lever to feel hollow or loose when you try to shift gears.
3. Synchronizers: The synchronizers in the gearbox help to smooth out the shifting process. If the synchronizers are damaged or worn out, they may not be able to do their job properly, which can cause the gearshift lever to feel clunky or difficult to move.
To determine the exact cause of the problem, it is best to have the car inspected by a qualified mechanic. They will be able to diagnose the issue and recommend the best course of action.
